- #1
sallychan
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Homework Statement
A student is skateboarding down a ramp that is 5.9 m long and inclined at 12° with respect to the horizontal. The initial speed of the skateboarder at the top of the ramp is 2.3 m/s. Neglect friction and find the speed at the bottom of the ramp.
Homework Equations
This is my steps:
As I don't know the weight of the student, I don't know the force. So I can't use F-ma
Vo=2.3
Vox= 2.3cos78°= 0.48
Voy= 2.3sin78°=2.25
t=0.32
ΔY (found by SOPHATOA) =Voy.t+1/2 a t^2
1.23= 2.25t+1/2(9.8) t^2
ΔX=Vox.t+1/2 a t^2
5.8=0.48(0.32)+1/2.a.(0.32)
ax=110.3
Vx=Vox+at
Vx=0.48+110.3(0.32)
Vx=35.8
Vy=Voy+at
Vy=2.25+9.8(0.32)
Vy=5.386
therefore the resultant of Vx and Vy is 36.2
The Attempt at a Solution
my answer is wrong
I really need some help :D