# Homework Help: Basic Physics Questions Need to Check My Answers

1. Jan 19, 2010

8. If the displacement of a car was 150 km [E] and the velocity was 50.0 km/h [E], what was
the time of travel?
A. 100 h [E]
B. 3.0 h
C. 100 h
D. 3.0 h [E]

(I divided 150 by 50)

9. The airport is 60.0 km away and you have 1.00 h to get there. If your speed for the first
40.0 minutes is 48.0 km/h, how fast must you travel in the remaining 20 minutes to get
there within the time?
A. 48.0 km/h
B. 84.0 km/h
C. 90.0 km/h
D. 180 km/h
( for this I converted the times to hours then I found the distance it travelled first then I subtracted it from the whole distance it has to travel then I divided the amount it still had to travel by the remaining time)

10. If the velocity of a car is 16 m/s and it travels for a time of 6.0 s, what is the
displacement? Express the displacement correctly.
A. 96 m
B. 10 m
C. 96 m
D. 10 m/s
(for this I multiplied the velocity by the time it travelled and inferred that it doesnt include direction)

11. A racoon travels from point A to point B in 11 s. If the racoon was displaced 55 m ,
what was its velocity? Express the number correctly.
A. 5.0 m/s
B. 5.0 m/s
C. 44 m/s
D. 66 m/s
(for this I divided the displacement by the time)

12. A car driver speeds up from 5.00 m/s [E] to 15.0 m/s [E] in 4.00 s. Determine the carâ€™s
acceleration.
A. 40.0 m/s2 [E]
B. 40.0 m/s [E]
C. 2.50 m/s2 [E]
D. 2.50 m/s [E]
(for this I subtracted the final velocity from the initial velocity and the divided this value from the time)

13. An 1800 kg Volkswagen travelling at 60.0 km/h impacts into a concrete barrier and stops
in 0.420 s. The magnitude of the collision force on the automobile is
A. 2.57 x 105 N
B. 7.14 x 104 N
C. 1.26 x 104 N
D. 1.08 x 105 N
(for this I first converted the speed to m/s then divided this by the time to get acceleration then I multiplied this by 1800 Kg is this the correct way to do it do i calculate the acceleration by dividing the given velocityby the time or is there another way to do it)

2. Jan 19, 2010

### cronxeh

All of the answers are correct

#13 :

impulse = mass*speed
speed = 16.67 m/s
mass= 1800 kg

force of collision = impulse/time

Last edited: Jan 19, 2010