A stone of mass 1.5 kg vertically thrown upward its initial velocity is 30m/s calculate the potential energy if its rises in 3 second
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m=1.5kg
g=9.8m/s
h=?
v=30m/s
t=3sec
Ep =?
h= s×t
=30×3
=90m
Ep= mgh
=1.5×9.8×90
=135×9.8
=1323J
g=9.8m/s
h=?
v=30m/s
t=3sec
Ep =?
h= s×t
=30×3
=90m
Ep= mgh
=1.5×9.8×90
=135×9.8
=1323J
Answered by
0
the ans shown in pic is wrong.
correct ans is as follows.
m=1.5 kg
u=30 m/s
t=3 s
s=ut+1*2gt*t
s=30*3+1/2*(-10)*3*3
s=90+(-5)*9
s=90-45=45 m
potential energy=mgh
=1.5*(10)*45
=15*45
=675 joules
correct ans is as follows.
m=1.5 kg
u=30 m/s
t=3 s
s=ut+1*2gt*t
s=30*3+1/2*(-10)*3*3
s=90+(-5)*9
s=90-45=45 m
potential energy=mgh
=1.5*(10)*45
=15*45
=675 joules
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