Answers

2016-01-19T17:30:08+05:30
K.E=P.E/4

at maximam height P.E is max
K.E=0

let x be the height
then
V²=2gx
K.E=1/2 mv²
=1/2 *m*2gx=mgx
P.E=mgh
=mg*(20-x)
=20mg-mgx

given mg*(20-x)/4=mgx
mg(20-x)= 4mgx
g(20-x)=4gx
9.8*20-9.8x=39.2x
196=39.2x+9.8x=49x
x=196/49=4 m

hope it helps
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