A ball is moving with a speed 20m/s collides with a smooth surface. The magnitude of change in velocity of the ball is
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the change is positive In velocity
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Initial velocity, v⃗ =20(−cos60°iˆ−cos30°jˆ)
Final velocity, v⃗ '=20(−cos60°iˆ+cos30°jˆ)
Change in velocity = Final velocity - Initial velocity
v⃗ '− v⃗ =20×(2cos30°jˆ)=403√2jˆ∣∣v⃗ '− v⃗ ∣∣=203√ m/s
Regards
Final velocity, v⃗ '=20(−cos60°iˆ+cos30°jˆ)
Change in velocity = Final velocity - Initial velocity
v⃗ '− v⃗ =20×(2cos30°jˆ)=403√2jˆ∣∣v⃗ '− v⃗ ∣∣=203√ m/s
Regards
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