A block of mass 10 kg accelerates uniformly from rest to a speed of 2m/s in 20 sec. What is the average power developed in time interval of 0 to 20 sec ?

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 Nv2-u2=2as4-0=2×[2-020]×s4=440×sor s=40 mW=Fs=1×40=40 JPower, P=Wt=4020=2 W

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