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## Homework Statement

The current world-record motorcycle jump is 77.0 m,

set by Jason Renie. Assume that he left the take-off ramp at

12.0º to the horizontal and that the take-off and landing

heights are the same. Neglecting air drag, determine his take-off

speed

## Homework Equations

R = [(v0)^2/g]*sin2(theta)

5 constant acceleration equations

## The Attempt at a Solution

Hi. I understand that I can use the range equation to solve this question, but I wanted to try and use the constant acceleration equations to try and understand it a little better, however I'm getting stuck.

Let u = the take off speed (magnitude of velocity vector)

u_x = ucos(12)

x_i = 0

x_f = 77

a_x = 0

t = ?

u_y = usin(12)

a = -9.8

y_i = 0

y_f = 0

I get stuck here because I don't know the time or final velocity components (not really sure how to use v_f = 0 for half the flight time either)