A vehicle starts from rest with a uniform acceleration until a velocity of 48 km/h is reached. It then moves with a constant speed until it decelerates and finally stops 600 m from the starting point. The whole journey takes 1 minute, and the magnitude of the deceleration is twice that of the acceleration. Calculate: The time (in seconds) it takes the vehicle to reach a velocity of 48 km/h.
The time (in seconds) the vehicle moves with a constant speed.
The time (in seconds) it takes the vehicle to decelerate and stop.
The acceleration of the vehicle (give your answer in m/s2).
The distance the vehicle travels with constant velocity (give your answer in m)/

its a 5.5 n

glad that

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.