JEE Main Physics question
What power must a sprinter, of mass 80 kg, develop from the start if he has to impart a velocity of 10 ms⁻¹ to his body in 4 s?
Answer: (A)
Solution
Work done = ΔKE = ½(80)(10²) = 4000 J. Power = 4000/4 = 1000 W = 1 kW.
What power must a sprinter, of mass 80 kg, develop from the start if he has to impart a velocity of 10 ms⁻¹ to his body in 4 s?
Work done = ΔKE = ½(80)(10²) = 4000 J. Power = 4000/4 = 1000 W = 1 kW.