Question

Avinash can run with a speed of 8 m//s against the frictional force of 10 N, and Kapli can move with a speed of 3 m//s against the frictional force of 25 N. Who is more powerful and why ?

Answer 1

Since power = force `xx` velocity,
power of Avinash, `P_A = (10N) (8m//s) = 80 W`
power of Kapil, `P_K = (25N) (3m//s) = 75 W`
Thus, `P_A gt P_K,` i.e., Avinash is more powerful then Kapil as he does more work (80J) per second then Kapil who does 75 J of work per second.