Question

A car mass 500 kg is moving with a speed of 15 km/h and another identical car is moving

with a speed of 45 km/h. Compare their kinetic energy.​

Answer 1

Answer:

Explanation:

let k1is a kinetic energy of first car and K2 of second car

K1 = (m/2)v12

K2 = (m/2)v22

K2/K1 = (v2/v1)2 = (30/15)2 = 4

Answer 2

Answer:

mass of both car are same 500 kg

speed of car A = 15km/h

speed of car B = 45km/h

k1= 1/2mv^2= 1/2 x 500 x 15

k2 = 1/2m^2 = 1/2 x 500 x 45

by comparing

k1   = ¹/₂ x 500 x 15   =  15   =    1  

k2     ¹/₂ x 500 x 45       45        2

k2 is 2 times k1

Explanation: