A block of mass 10 kg accelerates uniformly from rest to a speed of 2 m/s in 20 sec. the average power developed in time interval of 0 to 20 sec is
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One of the prominent writers of the 20th century, this guy wisely said that the world suffered from three evils. Which of these wasn’t one of them? A. Organised lying B.Nationalistic idolatry C.Universal deceit D.Non-stop distraction
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Answer:
2W
Explanation:
Given,
Mass of block, m=10 kg
Initial velocity, u=0
Final velocity, v=2 m/s
Time, t=20 sec
F=ma=m[v−ut]=10×[2−020]=1 Nv^2−u^2=2as4−0=2×[2−020]×s4=440×sor s=40
mW= Fs =1×40=40 J
Power,P=Wt=4020=2 W
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