Acar moves at a speed of 50 kilometers/hour. its kinetic energy is 400 joules. if the same car moves at a speed of 100 kilometers/hour, then its kinetic energy will be joules. the braking distance at the faster speed is the braking distance at the slower speed.

I just took this test its 1,600 and quadruple.

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.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000