A ball moving with a momentum of 15kgm/s, strikes against a wall at an angle of 30° and is deflected back with the same momentum at the same angle. Calculate the impulse.

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Solution

If we assume it reflects back with same angle then,
Impulse = Change in momentum
= p - (-p)
= 2p
= 2mvCos30
= 2 × 15 × √3 / 2
= 15√3 kgm/s

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A ball moving with a momentum of 15kgm/s, strikes against a wall at an angle of 30° and is deflected back with the same momentum at the same angle. Calculate the impulse.

If we assume it reflects back with same angle then, Impulse = Change in momentum = p - (-p) = 2p = 2mvCos30 = 2 × 15 × √3 / 2 = 15√3 kgm/s

If we assume it reflects back with same angle then,
Impulse = Change in momentum
= p - (-p)
= 2p
= 2mvCos30
= 2 × 15 × √3 / 2
= 15√3 kgm/s