A scooter of mass increases its speed from to in

PHYSICS · Single correct · CBSE · Physics · Work and Energy · Work and Energy

Problem

A scooter of mass 150 kg150\,\text{kg} increases its speed from 10 m s−110\,\text{m\,s}^{-1} to 20 m s−120\,\text{m\,s}^{-1} in 5 s5\,\text{s}. It then accelerates further from 20 m s−120\,\text{m\,s}^{-1} to 30 m s−130\,\text{m\,s}^{-1} in another 5 s5\,\text{s} under identical road conditions. Which statement about the average power required in the two intervals is correct? (a) Both intervals require the same average power (b) First interval requires more power; ratio P1P2≈53\dfrac{P_1}{P_2}\approx\dfrac{5}{3} (c) Second interval requires more power; ratio P2P1≈53\dfrac{P_2}{P_1}\approx\dfrac{5}{3} (d) Second interval requires more power; ratio P2P1≈35\dfrac{P_2}{P_1}\approx\dfrac{3}{5}

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