Home
Class 12
PHYSICS
A car of mass m is driven with accelerat...

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

A

RV

B

maV

C

`(R+ma)V`

D

`(ma-R)V`

Text Solution

Verified by Experts

The correct Answer is:
C
Force required to move with constant velocity
power`=`FV
Force is required to oppose the resistive force R and also to accelerate the body of mass with acceleration a.
power`=(R+ma)V`
Promotional Banner

Similar Questions

Explore conceptually related problems

A car of mass 500 kg is driven with acceleration 1 m//s^(2) along straight level road against constant external resistance of 1000 N. When the velocity is 5 m//s the rate at which the engine is working is :

A car is moving along a straight level road with constant speed. Then

A car of mass m is accelerating on a level smooth road under the action of a single F. The power delivered to the car is constant and equal to P. If the velocity of the car at an instant is v, then after travelling how much distance it becomes double? .

The velocity-time graph of a car moving along a straight road is shown in figure. The average velocity of the car is first 25 seconds is

The velocity-time graph of a car moving along a straight road is shown in figure. The average velocity of the car in first 25 seconds is

A car of mass one metric ton travels along a horizontal straight road with its engine working at a constant rate of 20kW. The resistance to motion of the card is 600N. Find the acceleration of the car at an instant, when its speed is 25 m//s

A railroad flatcar of mass M can roll without friction along a straight horizontal track. Initially, a man of mass 'm' is standing on the car, which is at rest. What is the velocity of the car if man runs to the left so that his speed relative to the car is v_(rel) .