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# A ball is moving horizontally towards left with speed 5m/s collides elastically with a vertical wall  which is moving to the right with a speed of 5m/s and rebounds. After rebounding the speed of the ball relative to ground will be? 5m/s 10 m/s 15m/s 20m/s

Arun Kumar IIT Delhi
7 years ago
Hi

$\ v_{1}-v_{2} = u_{2}-u_{1} \\=>v_{1}-5i=5i-(-5i) \\=>v_{1}=15i$

Thanks & Regards
Arun Kumar
IIT Delhi
911
8 Points
7 years ago
Thank you so much.