Question

A 10 kg mass has a KE of 125 J, what is its velocity?

Answer 1

5 m/s

Explanation:

`EK = 1/2 mv^2`

Given: `EK = 125J= 125 kgm^2/s^2, m = 10kg`

So `v^2 = (2EK)/m` and `v = sqrt ((2EK)/m)`

`v = sqrt((2*125(kgm^2)/s^2)/(10kg)) = sqrt(25m^2/s^2) = 5 m/s`

Note: I solve the units first; it helps prevent mistakes.