Question

An object is thrown upward with a speed of 11 m/s on the surface of planet X where the acceleration due to gravity is 5.5 m/s2 and there is no air. resistance. How long does it take for the object to return back to its initial position?

Answer 1

Let us assume the upwards direction as positive and the downwards direction as negative.

Gravitational acceleration on planet X = g = -5.5 m/s² (Negative as it is directed downwards)

Initial velocity of the object = V = 11 m/s

Time taken by the object to return to it's initial position = T

The object returns to it's initial position therefore the displacement of the object is zero.

T = 4 sec

Time taken by the object to return to it's initial position = 4 sec