MasteringPhysics CH 04 HW-Google Chrome e Secure https//session.masteringphysics

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MasteringPhysics CH 04 HW-Google Chrome e Secure https//session.masteringphysics.com/myct/itemView?assignmentProblemID 92374914 CH04 HW Problem 4.83 A skateboarder starts up a 1.0-m-high, 30 ramp at a speed of 6.1 m/s. The skateboard wheels roll without friction. t the top, she leaves the ramp and sails through the air Part A How far from the end of the ramp does the Express your answer with the appropriate units skateboarder touch down? IValue Units Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining

Explanation / Answer

Y = Uyt - 0.5gt^2

-1 = 1 sin 30 t - 0.5*9.8*t^2

4.9t^2 - 0.5t - 1 = 0

t = 0.5 + sqrt(0.5^2 + 4*4.9) / 9.8

= 0.505 s

X = Ux*t

X = 1 cos 30 *0.505 = 0.44 m

so the skateboarder lands 0.44 m from the ramp

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