Answer to Question #123736 in Physics for Susan Williams

Question

A body Q of mass 5 kg moving with a velocity of 30 ms-1 is suddenly hit by another body R. If the velocity of Q is changed to 50 ms-1, in the same direction, calculate the impulse it receives.

Answer 1

By definition, the impulse is the mass times velocity of the body:

$$p = mv$$

Thus, when the body of mass $m = 5kg$ obtain the velocity $\Delta v = 20m/s$ it means the body recieves the impulse:

$$\Delta p = m\Delta v = 5kg\cdot 20m/s = 100 kg\cdot m/s$$

Answer. 100 kg*m/s