A block is placed at the bottom of an inclined plane and projected upwards with some initial speed. It slides up the plane and stops after time \[{{t}_{1}}\]. It begins to slide back down to the bottom in a further time \[{{t}_{2}}\]. The angle of inclination of plane is \[\theta \] and the coefficient of friction between body and the surface is \[\mu \]. Then

A block is placed at the bottom of an inclined plane and projected upw

1.	A block is placed at the bottom of an inclined plane and projected upwards with some initial speed. It slides up the plane and stops after time \[{{t}_{1}}\]. It begins to slide back down to the bottom in a further time \[{{t}_{2}}\]. The angle of inclination of plane is \[\theta \] and the coefficient of friction between body and the surface is \[\mu \]. Then
A.	\[{{t}_{1}}={{t}_{2}}\]
B.	\[{{t}_{1}}>{{t}_{2}}\]
C.	\[{{t}_{2}}>{{t}_{1}}\]
D.	\[{{t}_{1}}=2{{t}_{2}}\]
Answer» D. \[{{t}_{1}}=2{{t}_{2}}\]