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A 5 kg ball and a 10 ball approach each ...

A 5 kg ball and a 10 ball approach each other with equal speeds of `21 ms^(-1)` . Determine their speeds after the elastic collision.

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A 10kg ball and a 20kg ball approach each other with velocities 20m//s and 10m//s respectively. What are their velocities after collision, if the collision is perfectly elastic ?

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Knowledge Check

  • Two balls of equal masses moving with equal speed in mutually perpendicular directions, stick together after collision. If the balls were initially moving with a speed of 30/√2 ms^(-1) each, the speed of their combined mass after collision is

    A
    30 `ms^(-1)`
    B
    `15 ms^(-1)`
    C
    `30/√2 ms^(-1)`
    D
    `30sqrt2 ms^(-1)`

  • A ball of mass m approaches a wall of mass M (M>>m), with speed 2 ms^(-1) along the normal to the wall. The speed of wall is 1 ms^(-1) towards the ball. The speed of the ball after an elastic collision with the wall is-

    A
    `2ms^(-1)` away from the wall
    B
    `3ms^(-1)` away from the wall
    C
    `4ms^(-1)` away from the wall
    D
    `5ms^(-1)` away from the wall

  • Two identical balls each of mass 4 kg are moving towards each other with speeds 2 m/s and 3 m/s respectively. They undergo head on perfectly elastic collision. Then impulse imparted by one ball on other is

    A
    12 Ns
    B
    8 Ns
    C
    20 Ns
    D
    40 Ns

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    Two balls of masses 10 kg and 20 kg approach each other with velocities 30 m/s and 20 m/s respectively . Calculate their velocities after they undergo a perfectly eleastic collision .

    Consider an oblique elastic collision between a moving ball and a stationary ball of the same mass. Both the balls move with the same speed after the collision. After the collision, the angle between the directions of motion of two balls is x degree. Find the value of x.

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    A 1.5 kg ball drops vertically on a floor hitting with a speed of 25 ms^(1) . It rebounds with an initial speed of 15 ms^(-1) . If the ball was in contact for only 0.03 , the force exerted on the floor by the ball is

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