Question

Power applied to a particle varies with time as

P = (3t² – 2t + 1) watts, where t is time in seconds. Then the

Change in kinetic energy between time t = 2s to t = 4s is-

• A. 46 J
• B. 52 J
• C. 92 J
• D. 104 J

Answer 1

Answer: (A)

46 J

Answer 2

P = 3t² – 2t + 1

̃ DK = $\int _ { 2 } ^ { 4 } \mathrm { Pdt }$ = 46 J