- #1
jubbly
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Homework Statement
A frictionless plane is 11.4 m long and inclined
at 39.4◦. A sled starts at the bottom with an
initial speed of 4.46 m/s up the incline. When
it reaches the point at which it momentarily
stops, a second sled is released from the top
of this incline with an initial speed vi. Both
sleds reach the bottom of the incline at the
same moment.The acceleration of gravity is 9.8 m/s
Find the initial speed of the second sled.
Answer in units of m/s
Homework Equations
x = (1/2) * a * t² + v0 * t
The Attempt at a Solution
t = 4.46/6.22
t = .717
So basically all I did was plug and chug...
11.4 = .5 * 9.8 * sin39.4 * .717^2 + v0 * .717
12.998 = v0 * .717
v0 = 18.129
Some reason I'm not getting the correct answer. Anyone want to tell me what I'm doing wrong? Thanks.