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Standard X

Physics

Kinetic Energy

As shown in t...

Question

As shown in the figure, a body of mass $m$ moving vertically with speed $3 m / s$ hits a smooth fixed inclined plane and rebounds with a velocity $v_{f}$ in the horizontal direction. If the angle of inclined is $30^{\circ}$ , the velocity $v_{f}$ will be____

3 m / s

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\sqrt{3} m / s

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1 / \sqrt{3} m / s

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This is not possible

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Solution

The correct option is A $3 m / s$
According to conservation of momentum we have,
$M (v_{x} + v_{y}) = M (v_{1 x} + v_{1 y})$
$v_{x} = 0, v_{y} = 3 m / s, v_{1 y} = 0$
$v_{1 y} = v_{y} = 3 m / s$

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As shown in the figure, a body of mass m moving vertically with speed 3m/s hits a smooth fixed inclined plane and rebounds with a velocity vf in the horizontal direction. If the angle of inclined is 30∘, the velocity vf will be____

The correct option is A 3 m/sAccording to conservation of momentum we have,M(vx+vy)=M(v1x+v1y)vx=0,vy=3m/s,v1y=0v1y=vy=3m/s

As shown in the figure, a body of mass $m$ moving vertically with speed $3 m / s$ hits a smooth fixed inclined plane and rebounds with a velocity $v_{f}$ in the horizontal direction. If the angle of inclined is $30^{\circ}$ , the velocity $v_{f}$ will be____

The correct option is A $3 m / s$
According to conservation of momentum we have,
$M (v_{x} + v_{y}) = M (v_{1 x} + v_{1 y})$
$v_{x} = 0, v_{y} = 3 m / s, v_{1 y} = 0$
$v_{1 y} = v_{y} = 3 m / s$