A moving body of mass m and velocity 3 km/hr collides with a body at rest and of mass 2m and then sticks to it. Now the combined mass starts to move, then the combined velocity will be :
Text Solution
Verified by ExpertsThe correct answer is:
D
Here : Mass of the body m 1 = m
Velocity of the first body u 1 = 312 m/sec
Mass of second body at rest m 2 = 2m
Velocity of second body u 2 = 0
After combination total mass of the body
M = m + 2m = 3m
Now from the law of conservation of momentum
M ν = m 1 u 1 + m 2\ u 2
(where M = m + 2m = 3m)
3mv = m × 3 + 2m × 0
v = 1 km/hr
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