Question

What is the mass of a child that has a KE of 400 J who is riding her bike at 3.9 m/s?

Answer 1

52.6 kg

Step-by-step explanation:

KE = 1/2mv^2

400 = 1/2 x m x 3.9^2

m = 2(400 J)/ ( 3.9 m/s)^2

m = 52.6 kg