- #1
Hilmy atha
- 13
- 3
Homework Statement
Vo = 5m/s
W to the left = 6N
Ffriction = 2N
F to the left = W - Friction = 4 N
m = 1kg
g = 10 m/s^2
Ramp length = 10m
sin a = 3/5
cos a = 4/5
Homework Equations
F = ma
Vt ^2 = Vo^2 + 2as
Vt = Vo + at
The Attempt at a Solution
Outside force (1) to cancel acceleration from weight
= 4N
So now a = 0
Now we calculate how much decceleration is need to stop the initial 5m/s
Vt ^2 = Vo ^2 + 2as
0 = 25 + 20a
a = 1,25 decceleratiom from outside force (2)
F2 = m.a = 1.25 N
So F1(to cancel initail acceleration) + F2(to cancel initial velocity) = 4 + 1.25 = 5.25N
Is there something wrong? The answer is not in the options :/
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