Question

The kinetic energy of a car with mass 10 kg and speed 10 m/s is 500 J. Find the kinetic energy if :-
(i) the speed is doubled.
(ii) the speed is tripled. ​

Answer 1

Answer:

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Explanation:

part(i)

Given:

mass of the car (m) = 10kg

speed of the car (v) = 10ms

A/Q

if speed is doubled than speed (v) = 10 X 2= 20ms

applying the formula,

KE=½mv²

KE= ½ X 10 X (20)²

KE= 5 X 400

KE= 2000J

part(ii)

Given:

mass of the car (m) = 10kg

speed of the car (v) = 10ms

A/Q

if speed is tripled than speed (v) = 10 X 3= 30ms

applying the formula,

KE=½mv²

KE= ½ X 10 X (30)²

KE= 5 X 900

KE= 4500J