1)With a constant acceleration, a cart starts with an initial velocity of 19 m/s
ID: 1278479 • Letter: 1
Question
1)With a constant acceleration, a cart starts with an initial velocity of 19 m/s and moves for 9 seconds. During this time, it travels 124 m. What is the object's final velocity in m/s?
2)
Is the following statement true or false?
A cart is given an initial push, and rolls up a ramp, then rolls back down. In the rolling-up and rolling-down trips, the directions of the acceleration experienced by the cart are opposite.
3)In one of the lab activities, the lab manual states that one end of the track must be lifted 6-7 cm above table. Approximately, how many inches is that?
4)A cart rolls up and down a frictionless ramp. Which of the following graph best describes its acceleration?
A
B
C
D
A
B
C
D
Explanation / Answer
1) s = u*t + 0.5*a*t^2
124 = 19*9 + 0.5*a*9^2
a = (124-19*9)/(0.5*9^2)
= -1.16 m/s^2
v = u + a*t
= 19 - 1.16*9
= 4.6 m/s <<<<<<<<-----------Answer
2) false
beacuse while it rolls up acceleration is opposite to otion. while rolls down acceleration is
in the direction of motion.
3) 6 cm = 6/2.54 = 2.36 inches
7 cm = 7/2.54 = 2.76 inches
4) figure needed
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