Question

a 1kg kick ball flying at 10m/s hits a wall and bounces off at 8m/s. what is the impulse?

a. 18 kgm/s
b. 20 kgm/s
c. 2 kgm/s
d. 19 kgm/s

Explanation:

Step1: Define the formula for impulse

Impulse \(J=\Delta p = m(v_f - v_i)\)

Step2: Assign values

Let the initial velocity \(v_i=- 10m/s\) (direction towards the wall) and final velocity \(v_f = 8m/s\) (direction away from the wall), mass \(m = 1kg\)

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Answer:

A. \(18kgm/s\)