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govind rathi Grade: 11
        

How to find the angle{theta} when the question is given like this


que: two equal discs initially at rest are in contact on a table. a third disc of same mass but of double radius strikes them symmetrically and itself comes to rest after impact.the coeficient of restitution is


1] 2/3


2] 9/16


3] 3/4


4] 8/17

6 years ago

Answers : (1)

Chetan Mandayam Nayakar
312 Points
										

let speed before collision be u, and after collision be v. conservation of linear momentum in the direction of motion of the bigger disk gives 2mv(2√2)/3=mu, v=3u/4√2, let 'theta' be the angle between u and v. coefficient of restitution


=v/(u(cosθ))=(3u/4√2)/(u(√8)/3)=9/16


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6 years ago
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