A ball is moving with speed 20 m/s collides with a smooth surface as shown in figure. the magnitude of change in velocity of the ball will be
1) 10root3 m /s
2) 20root m/s
3) 40/root3 m/s
4) 40 m/s

Dear student,

Initial velocity, v=20-cos60°i^-cos30°j^
Final velocity, v'=20-cos60°i^+cos30°j^
Change in velocity = Final velocity - Initial velocity
v'- v=20×2cos30°j^=4032j^v'- v=203 m/s

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