Question

A frictionless ramp is 21.0 meters long and is inclined at an angle of 15.0° above the horizontal. If a block is placed at the beginning of the ramp and released from rest, how long (in s) will it take to slide to the end of the ramp? Let g = 9.80 m/s2

Answer 1

I think answer is root 7 (2.64s)

Explanation:

In the given condition we must consider sin component of acceleration due to gravity along the inclined plane..i.e. a = gsin15°.

After that put the given values in the eqation:

S( displacement ) = 1/2 a t^2