Question

What is the new velocity of an 1140 kg car that was traveling at 13.6 m/s and slams on the brakes losing 50000 of energy?

Answer 1

Answer:

9.86m/s

Explanation:

let's get to the formula

kinetic energy = 1/2*m*v^2= .5*1140*(13.6)^2=105427.2 j

it looses 50k j of energy. so new energy = 105427.2-50000 = 554227.2

again use the formula for k.e

ans = 9.86 m/s