Posted by michelle on Wednesday, October 6, 2010 at 2:51pm.
A skateboarder, starting from rest, rolls down a 14.0m ramp. When she arrives at the bottom of the ramp her speed is 7.40 m/s.
(a) Determine the magnitude of her acceleration, assumed to be constant.
(b) If the ramp is inclined at 20.5° with respect to the ground, what is the component of her acceleration that is parallel to the ground?
please help! it would be much appreciated!!

posting again! please help!! physics  Henry, Thursday, October 7, 2010 at 9:25pm
a. V^2 = 2ad,
2ad = V^2,
2a*14 = (7.4)^2,
28a = 54.76,
a = 54.76/28 = 1.96 m/s^2.
b. a(hor) = 1.96*cos20.5 = 1.83 m/s^2.