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HW Chapter 6
6.8 A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a
constant force
F
= (30 N)
i
– (40 N)
j
to the cart as it undergoes a displacement
s
= (9.0
m)
i
 (3.0 m)
j
.
How much work does the force you apply do on the grocery cart?
6.14 You throw a 20N rock vertically into the air from ground level. You observe that
when it is 15.0 m above the ground, it is traveling at 25.0 m/s upward. Use the work
energy theorem to find a) its speed just as it left the ground; b) its maximum height.
6.27
Stopping Distance.
A car is traveling on a level ground with speed v
0
at the instant
when the brakes lock, so that the tires slide rather than roll. a) Use the workenergy
theorem to calculate the minimum stopping distance of the car in terms of v
0
, g, and the
coefficient of kinetic friction
μ
k
between the tires and the road. b) The car stops in a
distance of 91.2 m if v
0
= 80.0 km/h. What is the stopping distance if v
0
= 60.0 km/h?
Assume that the value of
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 Spring '07
 D.V
 Force, Work

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