2. A 0.75-kg mass moving with a speed of 5.0 m/s encounters a 0.25-kg mass movin

Question

2. A 0.75-kg mass moving with a speed of 5.0 m/s encounters a 0.25-kg mass moving in 0.75 kg 0.25 kg the opposite direction with
speed 5.0 m/s.
(i) Assume the two objects collide and stick together. What is the velocity of the combined mass after the collision?

(ii) Assume the objects collide in an elastic collision where no energy is lost. What is the final velocity of both objects?

A 0.75-kg mass moving with a speed of 5.0 m/s encounters a 0.25-kg mass moving in 0.75 kg 0.25 kg the opposite direction with speed 5.0 m/s. Assume the two objects collide and stick together. What is the velocity of the combined mass after the collision? Assume the objects collide in an elastic collision where no energy is lost. What is the final velocity of both objects?

Explanation / Answer

1)      mass of 0.75 kg = A mass of 0.25 kg = B
choose A's direction as + and B's direction as -
momentum before collision = momentum after collision
(massA x ViA) + (massB x ViB) = (massA + massB) x Vf
(0.75)(5) + (0.25)(5) = (0.75 + 0.25)Vf
5 = 1 Vf
Vf = 5
Vf = 5 m/s in original direction of A the final velocity will be also 5 m/s for 2nd part can be extracted by sam equation used

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