A car weighing one ton moves at a speed of 72 km / h. How fast a bus weighing 5 tons must move in order to have the same momentum.
v1 = 72 km / h = 72000 m / 3600 s = 20 m / s.
p1 = m1 * v1, where m 1 is the mass of the car.
p2 = m2 * v2, where m2 is the mass of the bus, v2 is the speed of the bus.
By condition, the impulses must be equal:
m1 * v1 = m2 * v2;
v2 = (m1 * v1) / m2 = (1000 kg * 20 m / s) / 5000 kg = (20 m / s) / 5 = 4 m / s.
In an hour, the bus will travel: 4 m / s * 3600 s = 14400 m.
Answer: 4 m / s or 14.4 km / h.
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