1. While exploring a cave, a spelunker starts at the entrance and moves the following

Question

distances in horizontal plane. She goes 50.0 m West, 150 m North, 80 m 60 ° S of E.
a) Draw the figure applying polygon method. (scale 40 m: 1 cm)
b) Find her resultant displacement from the cave entrance applying component method
2. Given: A = 2iƸ− 4jƸ B = −4iƸ+ 5jƸ− 2k෡. Find a) A•B b) B –A c) A+B d) A x B

e) angle between A and B

3. Given: r

Ԧ t = −2.0 cm + 0.4
cm
s
2
t
2
iƸ+ 3.0
cm
s
tjƸ

For the time interval from t = 2 to t = 6.0 s, find a)displacement b) average velocity

c) average acceleration

4. An object is thrown upward from a height of 60.0 m above ground, with a speed of 8.0
m/s. How high will the object rise? How long will it take the object reach the ground? What
is the object’s velocity upon hitting the ground? Where is the object and what is its velocity
2 s after it was thrown?
5. A ball is rolled on a flat surface with an initial velocity of 1.50 m/s and speeds up at a rate
of 0.8 m/s
2
. What is the ball’s velocity at a distance 5 m? How long will the ball travel to

attain a velocity of 15 m/s?
6. A projectile is launched, 10.0 m above the ground, with a velocity of 25.0 m/s at an
angle 40 above the horizontal. Determine the location and velocity of the projectile 2.0 s
after launch. Is the projectile still on its way up or already on its way down at that location?