A skateboarder, starting from rest, rolls down a 13.5-m ramp. When she arrives at the bottom of the ramp her speed is 7.45 m/s.
(a) Determine the magnitude of her acceleration, assumed to be constant.
m/s2

(b) If the ramp is inclined at 22.0° with respect to the ground, what is the component of her acceleration that is parallel to the ground?
m/s2

Question

A skateboarder, starting from rest, rolls down a 13.5-m ramp. When she arrives at the bottom of the ramp her speed is 7.45 m/s.
(a) Determine the magnitude of her acceleration, assumed to be constant.
m/s2

(b) If the ramp is inclined at 22.0° with respect to the ground, what is the component of her acceleration that is parallel to the ground?
m/s2

amistre64 · Answer

might want to us some energy formulas

amistre64 · Answer

potential energy at the top of the hill is equal to the kinetic energy at the bottom

P = K

mgh = 1/2 mv^2

or 

gh = v^2/2

but this is related to newtons second law by F = ma,  so gh = a