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A boy sleds down a hill and onto a frictionless ice-covered lake at 12.0 m/s.
In the middle of the lake is a 900-kg boulder. When the sled crashes into the boulder, he
is propelled backwards from the boulder. The collision is an elastic collision. The boy’s
mass is 35.0 kg and the sled’s mass is 3.0 kg.
a. What is the speed of the sled and the boulder after the collision?
b. If the collision takes place over a time of 0.5 s, what is the force on the boy?

Sagot :

Answer:

The speed of the sled and boulder after the collision is the same as the initial speed, 12.0 m/s. The force on the boy during the collision is calculated using the impulse-momentum theorem.

Explanation:



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