3 A ball has mass 0.4 kg and is hit by a wooden bat. The speed of the ball just before it is hit by the bat is \(6 \mathrm {~ms} ^ { - 1 }\)
The velocity of the ball immediately after being hit by the bat is perpendicular to its initial velocity. The speed of the ball just after it is hit by the bat is \(8 \mathrm {~ms} ^ { - 1 }\)
Show that the impulse on the ball has magnitude 4 Ns
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