Given data : \ \

mass ( m ) = 200 kg \ \

constant velocity ( v ) = 4 m/s \ \

kinetic coefficient of friction (µ_k) = 0.8 \ \

Earth gravity (g) = 9.8 m/s² \ \

Power required to pull a mass (P) = ? \ \

\ \

Gravity Force F_n = m g \ \

Substitute m = 200 kg and g = 9.8 m/s² \ \

F_n = (200)(9.8) \ \

F_n = 1960 N \ \

Friction Force F_f = F = µ_k F_n \ \

Substitute µ_k) = 0.8 and F_n = 1960 N \ \

F_f = (0.8)(1960) \ \

F_f = 1568 \ \

Power P = F v \ \

P = (1568) (4) \ \

P = 6272 W \ \

The power required to pulling is 6272 W \ \