A cannon was fired from a ship weighing 500 tons in the direction of its movement. How much did the ship’s

A cannon was fired from a ship weighing 500 tons in the direction of its movement. How much did the ship’s speed change if a 30 kg projectile flew out at a speed of 1 km / s relative to the ground? How much will the ship’s speed change if the projectile flies out at the same speed in the direction opposite to the direction of the ship’s movement?

Decision:
500,000v1 – 30,000 = 530,000v3
a) 500,000v1 = 530,000v3 + 30,000
b) 500,000v1 = 530,000v3 – 30,000
Answer: a) v1 = (530 000v3 + 30 000) / 500000 b) v1 = (530 000v3 – 30000) / 500000