To be realistic, if I wanted to talk about instances of projectile motion being violated in Hindi films, I could couldn't possibly do that with just a diskspace of 300 MB.
Of course, I am not saying that such rules are specifically violated only in Hindi films. Take, for example, Star Wars Episode IV: A New Hope. I will talk about that in a bit. But the difference between such wonderful non-physical occurences in Hollywood and Bollywood is the cheese factor. I think Hollywood might be cheesy, but Bollywood is more like gourmet cheese. It is the Philadelphia of cream cheeses. It is the Amul of cheese spreads. Hollywood is just something like I Can't Believe It's Cheese!

What the hell am I talking about? Ho hum. Let's get to it, then.

Projectile motion in a vacuum. Neglecting air resistance. It turns out that the path is a parabola. A parabola in the sense that the height from the ground varies as the square root of the horizontal distance travelled by the body. Air resistance doesn't change things very much at least for small distances and streamlined objects... Everywhere you go, everything you do, you better remember this projectile path otherwise dropping bombs on specific places might become a problem.

Space is mostly vacuum, right? The space outside the Death Star was vacuum, in Star Wars Episode IV: A New Hope. In vacuum, the path of a bomb dropped from a very fast rebel ship should definitely trace out a parabola (of course, in vacuum, you wouldn't hear the explosions as the other rebel fighters were being taken care of by dear ol' Darth, but that's another story). A planet size object (the Death Star), having a hole dug out that passes right through the center (where lies hidden the "main reactor"), the hole being "less than 2 meters across". Since the vertical distance is proportional to the square root of the horizontal distance, a bomb "aimed" into the hole would have a significantly higher probability of detonating after hitting the walls of the hole very near the surface than of  the Death Star. But, of course, we all know what happened in THAT movie. The path traced out by that bomb was more like a HYPERBOLA. Maybe even a hyperbole.

Anyway, we aren't here to discuss the shortcomings of Hollywood.

``Dream Girl, kisi shaayar ki ghazal, Dream Girl. Kisi jheel ka kanwal, Dream Girl. Kahin to milegi, kabhi to milegi. Aaj nahin to kal....''

A very very very very rich bachelor, played by the great great great (and then) young man Dharmendra, is in search of his Dream Girl, who (unfortunately for him) turns out to be Hema Malini (naheeein-uh!). One thing leads to another, and soon we add, among other ingredients, the following condiments and spices: a few bad guys, a couple of handicapped orphans singing their song while roaming the city in search of Hema Malini, and some great great great special effects.

The bad guys capture Hema and trap her in a tower of sorts (its a skyscraper, but what the fuck). There just happens to be another skyscraper (taller) right opposite. Dharmendra is not allowed access into the first building, so in all the wisdom bestowed upon him by the scriptwriters, he drives his motorbike up the 45 or whatever floors of that other taller building, right up to the rooftop.
From here on, all he has to do is get to the room in the opposite building where Hema Malini is being held (not that the bad guys really would want to make her their Dil Ki Raani if they weren't being paid for it!). Easier done than said, actually. Without worrying about the gravitational force of the earth, special effects takes care of the rest. The edge-on view shows the height difference between the two points - the initial position being the rooftop, the final position being the window in the building opposite - as being negotiated by a stunt rider in a PERFECT STRAIGHT LINE.

If you look closely (you don't have to try too hard, remember, it was the seventies, and you can still see the effect of the 70s in a lot of movies released now - nevermind computer graphics!), you will even see the ramp that they tried to delete out but failed.

So remember the next time you are trying to jump off a building - if you wish upon a Dream Girl that looks like Hema Malini, you might even trace out a straight line to your death! (Saala aisa Dream Girl rahega to straight line mein nahin jaayega to aur kya parabola mein jaayega!)