Question

A body is thrown with a speed of 30 m/s at angle 300 with horizontal from a horizontal floor. The time

after which it is moving perpendicular to it's initial direction of motion is -

(a) 6 sec (b) 3 sec

(c) 1.5 sec (d) Never​

Answer 1

Answer:

The answer could be either 6 seconds or never. Depends on which reference frame you are talking about which is either theoretical or practical.

Explanation:

Well! if you wanna talk about the real world, then the final direction of motion would never be perpendicular to the initial direction of motion, Because the parabola would be completed in only 3 seconds, And as soon as the object touches the ground, its acceleration will reach zero and the whole point of free-falling will be defiled. But somehow, if you manage to dig a hole deep enough for it to travel for some time then there is a possibility. Or in the theoretical sense, the answer would be 6 seconds.