Question

A body of mass m is projected with initial speed u at angle theta with the horizontal. The change in momentum of body after time t is

Answer 1

Explanation:

The answer is mgt

Answer 2

Answer: - mgt

Explanation:

At t=0, horizontal component of velocity= u cosθ

After time 't', horizontal component of velocity= u cosθ

At t=0, vertical component of velocity= u sinθ

After time 't', vertical component of velocity= u sinθ

Please refer to the attachment for your answer

Note: Let horizontal component be parallel to x-axis of Cartesian co-ordinate system and vertical component coincide with y-axis of Cartesian system

Also, symbols have their usual meanings