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AP EAMCET2015PhysicsLaws of Motion

A force (2 i + j - k ) N acts on a body, which is initially at rest. At the end of 20 ~s the velocity of the body is (4 i +2 j -2 k ) ms ⁻¹ , then the mass of the body is

Options

  1. A8 kg
  2. B10 kg
  3. C5 kg
  4. D4.5 kg

Correct answer

B. 10 kg

Step-by-step solution

| F |=F= 4+1+1 = 6 v= 16+4+4 = 24 Now, F= d p d t =m ( v-u t ) where, m = mass of body 6 =m ( 24 -0 20 ) m= 6 20 24 =10 ~kg

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