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A force vecF acts on two particles of ma...

A force `vecF` acts on two particles of masses m and 4.0m moving at the same speed but at right angles to each other, as shown in Fig. The force acts on both the particles for a time T. Consequently, the particle of mass m moves with a velocity 4v in its original direction. (a) Find the new velocity v' of the other particle. (b) Also find the change in the kinetic energy of the system.

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The correct Answer is:
(a)1.25 v ; (b)`8.6 mv^2`
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