Which would have greater impact- a ball with mass m thrown with speed 20 m - s or a ball with mass m - 2 thrown at speed 40 m - s -A- Ball with mass mB- both have the same kinetic energyC- depends on the surface on which the balls are thrownD- Ball with mass m - 2

The correct option is D Ball with mass m/2 K.E of ball with mass, m = 1/2 x m x 202 = 200 J K.E of ball with mass, m/2 = 1/2 x m/2 x 402 = 400 J Ball with sma ...

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Standard IX

Physics

Kinetic Energy

Which would h...

Question

Which would have greater impact; a ball with mass m thrown with speed 20 m/s or a ball with mass m/2 thrown at speed 40 m/s?

Ball with mass m

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Ball with mass m/2

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both have the same kinetic energy

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depends on the surface on which the balls are thrown

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Solution

The correct option is B
Ball with mass m/2

K.E of ball with mass, m = 1/2 x m x 20² = 200 J

K.E of ball with mass, m/2 = 1/2 x m/2 x 40² = 400 J

Ball with smaller mass but greater speed would hit harder.

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Which would have greater impact; a ball with mass m thrown with speed 20 m/s or a ball with mass m/2 thrown at speed 40 m/s?

The correct option is B Ball with mass m/2 K.E of ball with mass, m = 1/2 x m x 202 = 200 J K.E of ball with mass, m/2 = 1/2 x m/2 x 402 = 400 J Ball with smaller mass but greater speed would hit harder.

The correct option is B
Ball with mass m/2

K.E of ball with mass, m = 1/2 x m x 20² = 200 J

K.E of ball with mass, m/2 = 1/2 x m/2 x 40² = 400 J

Ball with smaller mass but greater speed would hit harder.