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Ball moving initally at 11 m/s

(a) magnitude m/s (moving ball)?

(b) direction ° (from the original direction of motion)?

Ball initally at rest

(c) magnitude m/s?

(d) direction ° (from the original direction of motion)?

How do I start this problem? Someone in my recitation had a problem similar to this and used three equations with three unknowns. I think it was conservation of KE, conservation of momentum, and something else but i dont remember.

My book briefly talks about this, but there are no sample problems to work with.

Thanks