Speed and Velocity (in 2 directions, constant motion)
1) A person walks 5.0km [East] in 2.00h. Then he walks 1.5km [West] in 0.50h. Finally
he walks 10.0km [East] in 2.25h.
a)
b)
c)
d)
What is the person’s average speed for the journey?
What is the person’s average velocity for the journey?
What is the person’s instantaneous velocity at 1.00h?
What is the person’s instantaneous velocity at 2.25h?
2) A person drove 4.0km [North] and then 6.4km [South].
a) If the person’s average speed was 65 km/h, how long did the trip take?
b) What was the person’s average velocity?
3) A person starts from home and drives with a velocity of 55km/h [East] for 30 minutes.
The person then drives with a velocity of 73km/h [West] for 45 minutes. Where is the
person now?
4) Two people start at the same location. One person jobs with a velocity of 3.5m/s
[East] for 30 minutes. The other jobs with a velocity of 1.5m/s [West] for 45 minutes.
Where is each person? How far apart are they?
5) You plan a 200. km trip on which you want to average a speed of 90. km/h. You
cover the first half of the distance at an average speed of only 48km/h. What must your
average speed be in the second half of the trip to meet your goal?
Speed and Velocity (in 2 directions, constant motion)
1) A person walks 5.0km [East] in 2.00h. Then he walks 1.5km [West] in 0.50h. Finally
he walks 10.0km [East] in 2.25h.
a)
b)
c)
d)
What is the person’s average speed for the journey?
What is the person’s average velocity for the journey?
What is the person’s instantaneous velocity at 1.00h?
What is the person’s instantaneous velocity at 2.25h?
2) A person drove 4.0km [North] and then 6.4km [South].
a) If the person’s average speed was 65 km/h, how long did the trip take?
b) What was the person’s average velocity?
3) A person starts from home and drives with a velocity of 55km/h [East] for 30 minutes.
The person then drives with a velocity of 73km/h [West] for 45 minutes. Where is the
person now?
4) Two people start at the same location. One person jobs with a velocity of 3.5m/s
[East] for 30 minutes. The other jobs with a velocity of 1.5m/s [West] for 45 minutes.
Where is each person? How far apart are they?
5) You plan a 200. km trip on which you want to average a speed of 90. km/h. You
cover the first half of the distance at an average speed of only 48km/h. What must your
average speed be in the second half of the trip to meet your goal?
Basic Word Problems for Acceleration
1. Myriam Bédard accelerates at an average 2.5 m/s2 for 1.5 s. What is her change in speed
at the end of 1.5 s?
2. A skateboarder rolls down a hill and changes his speed from rest to 1.9 m/s. If the
average acceleration down the hill is 0.40 m/s2, for how long was the skateboarder on
the hill?
3. Kerrin Lee-Gartner is moving at 1.8 m/s near the top of a hill. 4.2 s later she is traveling
at 8.3 m/s. What is her average acceleration?
4. A bus with an initial speed of 12 m/s accelerates at 0.62 m/s 2 for 15 s. What is the final
speed of the bus?
5. A snowmobile reaches a final speed of 22.5 m/s after accelerating at 1.2 m/s2
for 17 s. What was the initial speed of the snowmobile?