To accelerate a car we ignite petrol in the engine of the car. Since only an external force can accelerate the centre of mass, is it proper to sasy that the fore generated by the engine accelerates the car?

If the total external forces on the system of particle is zero, then find the velocity and acceleration of its centre of mass.

When the speed of a car moving with accelerated motion on a horizontal surface becomes four times than at the starting, then what is the change in its potential energy?

A car , starting from rest, accelerates at the rate f through a distance S then continues at constant speed for time t and then decelerates at the rate (f)/(2) to come to rest . If the total distance traversed is 15 S , then

A driver decreases the speed of a car from 25 ms^(-1) to 1 0 ms^(-1) in 5 second. Find the acceleration of the car.

A sports car accelerations from zero to a certain speed in t seconds. How long does it take for it to accelerate to twice that speed starting from rest, assuming the power of the engine to be constant (independent of velocity) and neglecting any resistance to motion?

If a car at rest, accelerates uniformly to a speed of 144 km//h in 20s , it covers a distance of

Obtain an expression of acceleration produced by gravity of earth. OR Obtain general equation of gravitation force at distance r from the centre of earth and derive the equation of acceleration due to gravity on the surface of earth.