Question

A glider of mass m₁ = 8 kg has a velocity v_1i = +2 m/s before colliding with a second glider of mass m₂ = 4 kg, moving with velocity v_2i = -4 m/s. After the collision the first glider has a velocity of v_1f = -1 m/s. This collision is

		Elastic
		Partially inelastic
		Totally inelastic
		Impossible

A glider of mass m1 = 8 kg has a velocity v1i = +2 m/s before colliding with a second glider of mass m2 = 4 kg, moving with velocity v2i = -4 m/s. After the collision the first glider has a velocity of v1f = -1 m/s. The final velocity v2f of the second glider is

v2f = +2 m/s

v2f = -2 m/s

v2f = +4.8 m/s

v2f = -4.8 m/s

Answer 1

Question 1

Given m₁ =8kg , v_1i = 2m/s and v_1f =-1m/s

m₂ =4kg , v_2i = -4m/s and v_2f = ?

First find final velocity of glider 2

Consider conservation of momentum

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Check if KE is conserved

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so

Since KE is not conserved and both objects are moving separately after collision

ANSWER: Partially Inelastic

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Question 2

Values are same as Question 1

Use conservation of Momentum

Given m₁ =8kg , v_1i = 2m/s and v_1f =-1m/s

m₂ =4kg , v_2i = -4m/s and v_2f = ?

First find final velocity of glider 2

Consider conservation of momentum

ANSWER: