Question

A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the brick's mass to the rock's mass

Answer 1

A

Step-by-step explanation:

e=1/2M
`V^(2)`

1/2
`M_(1)`9=1/2
`M_(2)`25

`(M_(1) )/(M_(2) )` =
`(25)/(9)`

Answer 2

let M be the mass of brick

let m be the mass of the pebble

.5M(3)^2 =KE

.5m(5)^2= KE

.5M9 = .5m25

9M = 25m

(9/25)M = m