Question

A cracker is fired and it rises through a height of 1000m find the velocity by which it is released and time taken to reach highest point take g=9.8 second square

Answer 1

s=1000
v=0
v power 2 =u power 2 -2gs
0 =u power 2 - 2(9.8)(1000)
u power 2= 19600
u =140m per s

t=u/g
=140/9.8
=14.28s