By definition, the magnitude of the impulse is given by
I = delta P
where,
delta P = variation of the linear amount of movement.
P = m * v
We have then:
I = delta P
I = delta m * v
I = (0.40) * (20) - (0.40) * (0)
I = 8 Kg * m / s
answer:
the magnitude of the impulse that the student exerted the ball was
I = 8 Kg * m / s
