A particle of mass m is moving in a straight line with momentum p. Starting at time t = 0, a force F = kt acts in the same direction on the moving particle during time interval T so that its momentum changes from p to 3p. Here k is a constant. The value of T is :
$2\sqrt {{k \over p}} $
$2\sqrt {{p \over k}} $
$\sqrt {{{2p} \over 2}} $
$\sqrt {{{2k} \over p}} $
Solution
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