Mathphys with 10-12 ! you once again if you see this

6. 1516.67

2. -2.78

2. 1.54 mph

Explanation:

010)

Impulse = change in momentum

F Δt = m Δv

F (0.018 s) = (0.65 kg) (42 m/s − 0 m/s)

F = 1516.67 N

011)

Momentum before = momentum after

m u = (m + M) v

(1400 kg) (-13.9 m/s) = (1400 kg + 5600 kg) v

v = -2.78 m/s

012)

Momentum before = momentum after

m u = (m + M) v

(5 ton) (4 mph) = (5 ton + 8 ton) v

v = 1.54 mph

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up