Question

how much force has to be applied on a body of mass 2kg to change its velocity from 10m/s to 20m/s in 2 sec
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Answer 1

Explanation:

F=m(V-U/t)

F=2(20-10/2)

=2×5=10

Answer 2

Explanation:

In 2s,v=20−10×2=0

As, K.E=

2

1

mv

2

So, kinetic energy at the highest point will be zero.