Answer:
ball took 9 seconds to reach at the end o the ramp.
Explanation:
Whitney rolls a ball down a ramp.
Length of the ramp = 18 feet
Speed by which the ball rolls down = 2 feet per second
Let the ball takes T seconds to reach the end of the ramp.
By the formula,
Time taken =

=

= 9 seconds
Therefore, ball took 9 seconds to reach at the end o the ramp.