Teaching DSSSB TGT Mock Test 2025 Physics Laws of Motion Newton's Laws of Motion

A ball moving with a momentum of 7 kg m/s strikes against a wall at an angle of 45° and is reflected at the same angle. Calculate the change in momentum?

1
-9.9 kg m/s
2
-6.7 kg m/s
3
-12 kg m/s
4
-14.5 kg m/s
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