The easiest one .
Classical Mechanics
Level
1
A ball of mass 20 grams moving with a velocity of 40 m/s along a straight line . After being hit by a bat , it moves with 60 m/s in the opposite direction . The magnitude of change in momentum is ( in kg m/s)
The answer is 2.
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1 solution
Change in momentum = m(v-u) = 20/1000 ( 40-(-60)) kg m/s ( As it moves in the opposite direction ) = 20/1000( 100) = 2 kg m/s .