How many times does the kinetic energy of a car increase when traveling 60 mph as opposed to traveling 30 mph? k. e. increases

The answer to the question is 4 times i.e the kinetic energy of the car will increase four times when it will move with 60 mph as opposed to travelling with 30 mph.

CALCULATION:

Let us a consider a body having mass m which is moving with a velocity v.

The kinetic energy of the body is calculated as -

                                 Kinetic energy K.E =

Let us consider the initial and final velocity of the car are denoted as .

Here,

The initial kinetic energy of the car

The final kinetic energy of the car

Hence, the ratio of final kinetic energy to initial kinetic energy is calculated as -

Hence, the kinetic energy of the car will be increased to 4 times when it will move with speed from 30 mph to 60 mph.

So basically the Kinetic Energy increases 4 times

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.