Question

A projectile is hit with speed 20 m/s at some angle, and it reaches a velocity of 3 m/s at the highest point. Calculate the time needed by this projectile to reach the ground if it is shot from the roof of a building 29m high.

Answer 1

H=19.95m

Step-by-step explanation:

Using 3rd equation of motion

V^2=u^2+2gh

g is negative since redardation is produced.

3^2=20^2-2×9.8×h

9=400-19.6h

391=19.6h

h=19.95m