My Noles As Your Teacher c y-cat dared vil tries to reenact Evel Krievel\'s 1974

Question

My Noles As Your Teacher c y-cat dared vil tries to reenact Evel Krievel's 1974 attempt to u p the 5 ak River Canyon n a rocket were motor de Tha canyon isi 400 m ide with the opposite ims at the same hei ht. The hei ht or the launch ram p at onerim of the canyon is h (e what is the mirimum launch speed required for the daredevil to make it across the canyon? Neqlect the air resistaice and wind, xress our answer to three sinificant fiqures. (b) Famous after his succeful first jump, but stil recocring from the injurics auztained in the crh caused by a strong bounce upon landing, the daredevil decides to jump açain but to add a landing ramp with aslope that will match the angl of his veloay at landina. If the height of the landing remp et the opposite rim is 4 m, what is the new required launch speed? xes ecur answer to three signficant fiqures.) Submit Answer Save Progress Pracice Another Version

Explanation / Answer

Let the launch speed be u

So, u*cos(45 deg)*t = 400

Also, along vertical :

-5 = u*sin(45 deg)*t - 0.5*9.8*t^2

Solving the above two equations :

we get , u = 62.2 m/s <--------------- answer

t = 9.1 s

b)

Vx = u*cos(45 deg)

400 = u*cos(45 deg)*t ---------(1)

s = ut + 0.5*at^2

So, -1 = u*sin(45 deg)*t - 0.5*9.8*t^2 ----------(2)

Solving both equations, we get :

u = 62.5 m/s <------ answer

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