Work Energy and Power - Result Question 51

54. An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12ms1 and the second part of mass 2kg moves with speed 8ms 1. If the third part flies off with speed 4ms1 then its mass is

[2013]

(a) 5kg

(b) 7kg

(c) 17kg

(d) 3kg

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Answer:

Correct Answer: 54. (a)

Solution:

  1. (a)

=mv2+mv22=32mv2



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