A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

A. 1.25 x 10⁴W
B. 2.50x 10⁴W
C. 1.25 x 10⁶W
D. 2.50 x 10⁶W

Correct Answer:

Option B = 2.50x 10⁴W

Explanation

P = mv²/t = ^800×25×25/₂₀
2.5 x 10⁴W