could you answer, please asap
a) initial height = 20 m
b) maximum height reached = 100 m
time taken to reach maximum height = 4 seconds
height travelled = 100-20=80 m
let initial velocity be u
80=u*4 - 0.5*10*42=4u-80
u=40 m/s
c)maximum height = 100 m
d)time taken to fall through 100 m = 8.5-4=4.5 seconds
final velocity = 10*4.5=45 m/s
e)total time of trip = 8.5 seconds
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