A skateboarder, starting from rest, rolls down a 11.5 m ramp. When she arrives a

Question

A skateboarder, starting from rest, rolls down a 11.5 m ramp. When she arrives at the bottom of theramp her speed is 7.65 m/s. (a) Determine the magnitude of heracceleration, assumed to be constant.
1 m/s2

(b) If the ramp is inclined at 23.5°with respect to the ground, what is the component of heracceleration that is parallel to the ground?
2 m/s2
(a) Determine the magnitude of heracceleration, assumed to be constant.
1 m/s2

(b) If the ramp is inclined at 23.5°with respect to the ground, what is the component of heracceleration that is parallel to the ground?
2 m/s2

Explanation / Answer

(a) use .        v2 = 2 a d       or       7.652 = 2 a 11.5 .      a = 2.544m/s2 . (b)            x component = 2.544 * cos23.5 =    2.333m/s2 . (b)            x component = 2.544 * cos23.5 =    2.333m/s2

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