Explanation:
6. Force = mass × acceleration
F = m Δv / Δt
F = (0.155 kg) (50.0 m/s − (-44.0 m/s)) / (0.00450 s)
F = 3240 N
7. Force = mass × acceleration
75 N = (180 kg) (2.0 m/s − 0 m/s) / Δt
Δt = 4.8 s
