Answer:
49 watt
Explanation:
speed, v = 0.5 m/s
mass, m = 40 kg
μ = 0.25
As the block is moving with constant speed so the net acceleration is zero.
It means the applied force is equal to the friction force
F = μ mg = 0.25 x 40 x 9.8
F = 98 N
Power = Force x velocity
P = 98 x 0.5 = 49 Watt
Thus, the power is 49 watt.
