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A ball moving with momentum with 5 kg m/s strikes against a wall at 45 and is reflected at the same angle. Calculate the magnitude of change of momentum.

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by chrisle

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by chrisle

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The Brainliest Answer!

Initial momentum = 5 kg m/s

perpendicular component = 5 cos 45 = 5/√2 kg m/s

parallel component = 5 sin 45 = 5/√2 kg m/s

After hitting the wall, it reflects at same angle.

So magnitude will the same = 5 kg m/s

parallel component = 5 sin 45 = 5/√2 kg m/s

perpendicular component = -5 cos 45 = -5/√2 kg m/s

(- sign comes due to change in direction)

So you can see that there is no change in parallel component.

Only perpendicular component changes.

So change = 5/√2 kg m/s - (-5/√2 kg m/s)

= 5/√2 kg m/s+5/√2 kg m/s

= 10/√2 kg m/s

=