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A motorcycle daredevil wants to ride up a 50.0m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0m/s , how many barrels can be used?




A motorcycle daredevil wants to ride up a 50.0m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0m/s , how many barrels can be used?

(CORRECT ANSWER D.)

a. 79 b. 318 c. 332 d. 355 e. 402

I'm not sure how you get to the answer.

I start by solving for time in the equaton: Yf = Yi + Viy + 1/2g(t)^2

Plugging in: 0 = 50sin30 + 60sin30 + 1/2(-9.8)(t)^2

I end up getting t = 3.35 and proceed to solve for x (the distance) x=x0+vi*cos30*t . Solving for x, I get 174.071

What am I doing wrong?

 


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