Question

with what velocity should a ball be thrown vertically upward so that it reaches aheght of 40 m

Answer 1

HEY THERE  

GIVEN THAT -

Height , H = 40 m

velocity ,u = ?

using the formula  

⇒u =  √2gh

⇒u = √(2× 10 ×40 )

⇒u = √800

⇒u = 28.4 m/s

Hence the initial speed must be 28.4 m/s

@Aish