13.4k views
3 votes
SOMEONE HELP ME!!!!!!!

calculate the kinetic energy of car of mass 150kg moving with velocity of 30km/h. what will be the kinetic energy when it's velocity is doubled and then tripled?​

User Lander
by
3.2k points

1 Answer

4 votes

Answer:

The correct answer is -

1. 67500 J

Step-by-step explanation:

The formula for KE is

K. E. = 1/ 2 *m v ^2

So input the values we know:

K . E. = 1/2 ⋅*150 *30 ^2

K . E. = 150 * 900 /2

K . E . = 67500

K . E. = 67500

If the velocity is double then;

use 2v in the formula

K. E. = ( 1/ 2 )*m(2 v) ^2

= (1/2)*4m v ^2

it is four times to original Kinetic energy, and similarly if tripled then, it will be 9 times to original.

User Ikumi
by
3.0k points