+1 vote
in Machine Kinematics by (38.0k points)
A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 50 Kg mass in m/s after collision when the collision is elastic.

(a) 2.5

(b) 2.00

(c) 7.25

(d) 6.75

I had been asked this question in a dream while sleeping

My doubt stems from Loss of Kinetic Energy During Elastic Impact topic in section Kinematics & Kinetics of Motion of Machine Kinematics

1 Answer

0 votes
by (106k points)
The correct option is (b) 2.00

Explanation: Velocity during elastic collision is given by

m1u1 + m2u2/(m1+ m2) = v

substituting the values we get

V = 2.5 m/s

v1 = 2V – u1

v1 = 2m/s

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