Question

a car of mass M is driven with an acceleration along a straight level road against the constant external resistive force R . when the velocity of car is V, the rate at which engine of the car is doing work will be


(a) R.v
(b)ma.v
(c)R+ma . v
(d)ma-R . v
​

Answer 1

Answer:

c will be the correct option

Answer 2

Answer:

(R + ma )v

Explanation:

Answer: (R+ma)V

Force required to oppose resistive force R and move with acceleration a is R+maR+ma

Power of a body is defined as the rate at which the body can do the work. Power=Force ×× Velocity

=(R+ma)V