A moving body of mass m and velocity 3 km/h collides with a body at rest of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity

3 km/h

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2 km/h

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1 km/h

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4 km/h

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Solution

The correct option is C
1 km/h

Initial momentum = $m \times 3 + 2 m \times 0 = 3 m$

Final momentum = $3 m \times V$

By the law of conservation of momentum

$3 m = 3 m \times V \Rightarrow V = 1 k m / h$

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A moving body of mass m and velocity 3 km/h collides with a body at rest of mass 2m and sticks to it. Now the combined mass starts to move. What will be the combined velocity

The correct option is C 1 km/h Initial momentum = m×3+2m×0=3m Final momentum = 3m×V By the law of conservation of momentum 3m=3m×V⇒V=1km/h

The correct option is C
1 km/h

Initial momentum = $m \times 3 + 2 m \times 0 = 3 m$

Final momentum = $3 m \times V$

By the law of conservation of momentum

$3 m = 3 m \times V \Rightarrow V = 1 k m / h$