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Physics Test 83...

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  • Question 1
    4 / -1

    A ball A of mass 1 kg is projected vertically upwards from ground with a speed of 20 m/s. At the same instant another ball B of mass 3 kg which is initially above ball A is dropped from a height of 20 m. The two balls collide in air and stick together. The kinetic energy of combined mass just after collision is :-

  • Question 2
    4 / -1

    A ball falls freely from a height of 50 m and rebounds several times from ground. If total distance covered by the ball is 100 m, the value of coefficient of restitution e is :-

  • Question 3
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    A projectile of mass 3m explodes at highest point of its path. It breaks into three equal parts. One part retraces its path the second one comes to rest. The range of the projectile was 100 m if no explosion would have taken place. The distance of the third part from the point of projection when it finally lands on the ground is:

  • Question 4
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    Two circular discs having radius R and mass density σ and 2σ respectively are placed as shown in figure. Find out position of centre of mass of the system w.r.t. point O :-

  • Question 5
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    A body of mass 2kg moving with a velocity m/sec collides with another body of mass 3kg moving with a velocity  m/sec. If they stick together, the velocity in m/sec of the composite body is:

  • Question 6
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    A ball of mass m moving at a speed V makes a head on collision with an identical ball at rest. The kinetic energy of the balls after the collision is 3/4 th of the original then coefficient of restitution for the collision is :

  • Question 7
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    A ball is projected from ground with a velocity v at an angle θ to the vertical, on its path it makes an elastic collision with a vertical wall and returns to ground. The total time of flight of the ball is:

  • Question 8
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    At t = 0 the positions and velocity of the two particles are as shown in the figure. They are kept on a smooth surface and being mutually attracted by gravitational force. Then position of centre of mass at t = 2 sec :

  • Question 9
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    A truck moving on horizontal road towards east with velocity 20 m/sec collides elastically with a light ball moving with velocity 25 m/sec along west. The velocity of ball just after collision is:

  • Question 10
    4 / -1

    If collision takes place between 2 particles then which of the following statement is true :

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