Question

A 30 kg boy pushes on a 15 kg sled with for force of 20 N for 5 seconds. What is the magnitude of the impulse to the 15 kg sled?

Answer 1

Below

Step-by-step explanation:

Find acceleration of sled

F = ma

20 = 15 a shows a = 1.33 m/s^2

Find final velocity

v = at = 1.33 (5 ) = 6.666 m/s

change in momentum = mv2-mv1 = impulse = 15 * 6.666 - 0 = 100 kg m/s

I think it might be easier to just say F *Δ t = 20 * 5 = 100 N s = 100 kg m/s