1.

A small sphere is projected with velocity `5(m)/(s)` in a direction `37^(@)` from the horizontal y-axis on a smoother inclined plane. The motion of sphere takes plane in x-y plane. Magnitude of its velocity after 2 s is:A. `sqrt(65)`B. `sqrt(55)`C. `sqrt(36)`D. `sqrt(45)`

Answer» Correct Answer - A
`v_(y)=5cos37^(@)=5xx(4)/(5)=4(m)/(s)`
`v_(x)=usin37^(@)-(gsin30^(@))xxt`
`v=sqrt(v_(x)^(2)+v_(y)^(2))=sqrt(49+16)=sqrt(65)`


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