Question

A particle is fired from ground with speed u making an angle theirs with the horizontal. The speed of the projectile just before hitting the ground will be ( neglect air friction)
1)u
2)ucos
3)u/2
4)usin

Answer 1

Answer:

u

Explanation:

The initial and final speed of a projectile is same.

In the given case:

1. the horizontal component of velocity remains same throughout the journey (since there is no acceleration along the horizontal axis)
2. the vertical component of initial velocity reaches zero at maximum height and then retains its initial speed when it just touches the ground. It can be proved by "conservation of energy".