certain force acting on a 20 kg mass change its velocity from 5 metre per second to 2metre per second calculate the work done by a force ans -210j
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Answer:
210 J
Explanation:
m=20kg
v1=5 ms
KE1=1/2mv1^2
=1/2×20×5×5
=250J
v2=2ms
KE2=1/2mv2^2
=1/2×20×2×2
=40
Work done=Change in KE=KE1-KE2=250-40=210J
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