A cannon is mounted on the back of an ice sled. Together, the cannon and sled have a mass of 4.0 x 10^3 kg. If a 50.0 kg shell is now loaded into the cannon and fired horizontally at 150 m/s, what is the speed of the sled after firing the cannon?

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s