A batsman hits back a ball of mass 0.4 kg straight in the direction of the bowler without changing its initial speed of $15 \mathrm {~m} \mathrm {~s} ^ { - 1 }$. The impulse imparted to the ball is $\_\_\_\_$ Ns.
A batsman hits back a ball of mass 0.4 kg straight in the direction of the bowler without changing its initial speed of $15 \mathrm {~m} \mathrm {~s} ^ { - 1 }$. The impulse imparted to the ball is $\_\_\_\_$ Ns.