Question

A 5.0 n force is applied to a 3.0 kg ball to change its velocity from +9.0m/s to +3.0m/s. The impulse on the ball is ____ n s

Answer 1

Take into account that the impulse is given by:

$I=m\Delta v=m(v-v_o)$

where,

m: mas of the ball = 3.0kg

v: final speed = 3.0m/s

vo: initial speed = 9.0m/s

replace the previous values into the formula for I and simplify:

Hence, the impulse is -18 kg*m/s (it's negative due to the force is opposite to the motion of the ball)