Question

A ballis thrown vertically upward from ground when it is at 3/4th of its max ht its speed is 20 m/s.The speed of throw

Answer 1

Answer:

Explanation:After reaching the maximum height , it falls for 2seconds to reach the 25 m height.

Distance it has fallen is h = 0.5 gt^2 = 0.5*10* 4 =20 m.

Maximum height is 25+20 = 45 m.

Velocity at the bottom or the initial velocity is found from

u^2 = 2gh = 2*10*45 =900

u = 30 m/s.