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Verified answer
Because the work is done against the gravitational force
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Answer:
Correct option is
A
30J
Momentum will be conserve.
So, mv=(m
1
+m
2
)u
10×3=(10+5)×V
V is a velocity of the composite mass
On solving, we get
30=15×V
V=2m/s
So, KE=
2
1
mv
2
=
2
1
×(10+5)(2)
2
=
2
1
×15×4=30kg−m
2
/sec
2
KE=30kg−m
2
/sec
2