A ball is thrown vertically words from ground when it is at three fourth of its maximum height its speed is 20 metre per second the speed of throw is

Asked by nikhat0200 | 28th Aug, 2019, 07:19: AM

Expert Answer:

I n i t i a l space V e l o c i t y space equals space u
M a x space h e i g h t equals space H
V e l o c i t y space a t space 3 over 4 H equals 20 m divided by s
M a x i m u m space h e i g h t space c a n space b e space c a l c u l a t e d space u sin g space 3 r d space e q u a t i o n space o f space m o t i o n
v squared equals u squared plus 2 a s
0 equals u squared minus 2 g H
H equals fraction numerator u squared over denominator 2 g end fraction
V e l o c i t y space a t space h equals 3 over 4 H space i s space 20 space m divided by s space
20 squared equals u squared minus 2 g 3 over 4 H

20 squared equals u squared minus 2 g 3 over 4 open parentheses fraction numerator u squared over denominator 2 g end fraction close parentheses
400 equals u squared over 4
u equals 40 m divided by s

Answered by Utkarsh Lokhande | 28th Aug, 2019, 10:02: AM