A block of mass 4 kg accelerates uniformly from
rest to a speed of 5 m/s in 20 s. The average
power developed in time interval of 0 to 20 s is
1) 1W 2) 3W
3) 2.5W 4) 5W
Answers
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1
Answer:
4) 5W
Explanation:
a=(v-u) / t
a=(5-0)/20
a=5/20 = 0.25m/s²
F=ma=4×0.25 = 1N
Power = Force × velocity
=1×5
=5W
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