Question

The time taken by a block of wood (initially at rest) to slide down a smooth inclined plane 9.8 m long (angle of inclination is `30^(@)`) is

A. `(1)/(2)s`
B. 2 s
C. 4 s
D. 1 s

Answer 1

Correct Answer - B
For one dimensional motion along a plane
`S=ut+(1)/(2)at^(2) rArr 9.8=0 +(1)/(2)g sin 30^(@)t^(2)rArr t=2s`