- #1
Zynoakib
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Homework Statement
Q69
Homework Equations
F=ma
v = u + at
v^2 = u^2 + 2as
s = ut + (1/2)at^2
The Attempt at a Solution
Find the deceleration by friction:
F = ma
0.1 = (0.2)a
a = 0.5 ms^-2
and the acceleration of the mug would be 3 - 0.5 = 2.5 ms^-2
Find the time required for the tablecloth to travel 30 cm
u = 0, , s = 0.3, a = 3, t = ?
s = ut + (1/2)at^2
0.3 = (1/2)(3)(t^2)
t = 0.447 s
Find the displacement of mug within 0.447s
t = 0.447, s = ?, u = 0, a = 2.5
s = ut + (1/2)at^2
s = (1/2)(2.5)(0.2)
s= 0.25 m , but the answer is 0.06 m
Thanks!