A mass of 10 g moving horizontally with a velocity of 100 cms-1 strikes a pendulum bob of mass 10 g. Length of string is 50 cm. The two masses stick together. The maximum height reached by the system now is (Take, g = 10 ms-2)

A mass of 10 g moving horizontally with a velocity of 100 cms-1 strikes a pendulum bob of mass 10 g. Length of string is 50 cm. The two masses stick together. The maximum height reached by the system now is (Take, g = 10 ms-2)

  1. A

    7.5 cm

  2. B

    5 cm

  3. C

    2.5 cm

  4. D

    1.25 cm

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    Solution:

    From conservation of linear momentum, velocity of combined mass just after collision will be 50 cms-1, as mass has doubled. 

    Now,  H=u22g=(0.5)220 m=1.25 cm

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