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Q. A small ball of mass 50 g is suspended from a string of length 66-cm and whirled in a circle lying in the horizontal plane. If the string makes an angle of 21? with the vertical, find the centripetal force experienced by ball. The acceleration of gravity is 9.80 m/s2.

Q. A 9400 kg boxcar travelling at 21.00 m/s strikes a second boxcar at rest. The two stick together and move off with the speed of 12.0 m/s. What is the mass of the second car?

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Category:- Physics
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