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Tutorial 3
10/13/10
Problem 1.
A bullet is shot straight into the air at 300m/s. At what time or times does the
bullet reach 1mi in altitude?
Problem 2.
A sailboat has a constant velocity in the +x direction of
v
= 5
.
0
m/s
. At
t
= 0
the wind begins blowing causing the sailboat to have an acceleration in the

x
direction of
a
=

0
.
5
m/s
2
.
a) How far does the sailboat get from its initial starting position at
t
= 0?
b) When does it come back to
x
= 3
m
?
Problem 3.
A person is inside an elevator 10 meters above the ground when the cable breaks
and it begins to fall. The person inside is pretty smart and realizes that if a jump is timed
exactly when the elevator hits the bottom, their ﬁnal velocity can be canceled.
a) What time after the cable breaks should the person jump?
b) In order to completely cancel their velocity, with what velocity (relative to the elevator)
would the person need to jump? (aka you want
v
person
+
v
elev
= 0
c) If they could jump at this velocity on stable ground, how high would they go? Can anyone
save themselves by using this technique?
Problem 4.
A motorcycle has a 0–100km/h time of only 3.5 seconds. Assuming it can
decelerate only 2/3 as fast as it can accelerate, answer the following questions:
a) What is the motorcycle’s acceleration during the ﬁrst 3.5 seconds?
b) How long will it take the motorcycle to go 0 to 100km/h back to 0?
c) What is the minimum distance required to go up to 100km/h and back to 0?
Problem 5.
A jogger with constant velocity of 4.0 m/s runs by and wakes up a sleeping dog.
After 1s the dog begins chasing the jogger. The acceleration of the dog is 1.5m/s
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This note was uploaded on 11/21/2010 for the course PHYSICS Physics 2 taught by Professor Manojkaplinghat during the Fall '10 term at UC Irvine.
 Fall '10
 ManojKaplinghat
 Physics

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