April sits at rest on a skateboard. She has a mass of 65 kg. Her friend throws

her a suitcase (m= 15 kg) at a speed of 3 m/s. If she catches it, how fast will

she, the skateboard, and the suitcase move?

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Answer:Explanation:GivenRepresent mass of April with M and mass of the suitcase with m; such thatRepresent initial velocity of April with U and initial velocity of the suitcase with u; such that(because she’s resting on the skateboard, initially)

After she catches the suitcase, she, the skateboard and the suitcase moves at the same velocity.Represent this velocity with vThe above given information can be representing using law of conservation of momentum.

Substitute the values of M,U, m and u.

This gives

Divide both sides by 80Hence, they moved at a velocity of 0.5625m/s