Q. A ball of weight $0.1\ kg$ coming with speed $30\ m/s$ strikes with a bat and returns in opposite direction with speed $40\ m/s$, then the impulse is (Taking final velocity as positive)
A) $- 0.1 \times (40) - 0.1 \times (30)$
B) $0.1 \times (40) - 0.1 \times ( - 30)$
C) $0.1 \times (40) + 0.1 \times ( - 30)$
D) $0.1 \times (40) - 0.1 \times (20)$
Explanation
(b) Impulse = change in momentum
$mv_{2} - mv_{1} = 0.1 \times 40 - 0.1 \times ( - 30)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.