Question

With what speed must a ball be thrown vertically up in order to rise to a maximum height of 45 m? And for how long will it be in air?

Answer 1

Answer:

30 m/s

Explanation:

Maximum Height = 45 m

g = 10 m/s²

Maximum height = u²/2g

= 45 = u²/2 × 10

= 45 = u²/20

= 900 = u²

= u = 30 m/s

Hence the ball must be thrown with a Velocity 30 m/s