Which has a greater momentum, an airplane parked in a hangar or a car going down a hill?

If a 30-kg boy riding a 7-kg bicycle has a total momentum of 115 kg. m/s, what is the velocity of the boy and the bicycle put together?

**Answer:**

An airplane parked in a hangar has zero momentum since it is at rest. On the other hand, a car going down a hill has momentum due to its motion. Therefore, the car going down a hill has greater momentum than an airplane parked in a hangar.

To calculate the velocity of the boy and the bicycle put together, we can use the formula:

Momentum = mass x velocity

Given that the total momentum is 115 kg·m/s, and the total mass of the boy and the bicycle is 30 kg + 7 kg = 37 kg, we can rearrange the formula to solve for velocity:

Velocity = Momentum / Mass

Velocity = 115 kg·m/s / 37 kg

Velocity ≈ 3.1081 m/s

Therefore, the velocity of the boy and the bicycle put together is approximately 3.1081 m/s.

**Explanation:**

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