Question

Certain force acting on a 20 kg mass changes its velocity from
5 ms-1 to 2 ms-1Calculate the work done by the force.​

Answer 1

Answer:

40 J

Explanation:

Certain force acting on 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force. (E k)2 = (1 )/2x 20 — (2)2 = 40 J.

Answer 2

Answer:

ans=-30J

Explanation:

work done = 1/2 X m X v^2

m=20kg

v=2-5

v=-3

=1/2 X 20 X -3

=10 X -3

= -30J

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