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pranav9189

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**1**) A box of 20 kg mass is pulled by force F with constant velocity on a horizontal surface. If force of friction is 49N, work done during displacement of 10m is ________ J.

(a) 490

(b) 245

(c) 980

(d) zero

W=Fxs

W= change in kinetic energy

W=0 (constant velocity)

Which equation will be used?

**2)**Engine of a car of mass 1500 kg keeps car moving with constant velocity 5m/s. If frictional force is 1000 N, power of engine is ____________

(a) 5 kW

(b) 7.5 kW

(c) 15 kW

(d) 75 kW

p=mv (momentum)

Which answer in the above question?

Please reply as early as possible.

Pranav