Question

level 1
a train travels north at 103 km/h.
this is an example of
a. velocity
b. speed
c. acceleration
d. speed and acceleration
level 1
what is the speed of a rocket that travels 9,000 meters in 12 seconds?
a. 0.001 seconds
b. 750 seconds
c. 750 m/s
d. 108,000 m/s
level 1
if john mows 11.5 meters of lawn from east to west in 7.1 seconds, what is the velocity of the lawnmower?
a. 0.6 m/s east
b. 0.6 m/s west
c. 1.6 m/s east
d. 1.6 m/s west
level 1
in 17.2 seconds, a shopping cart is pushed 15.6 meters towards the west. what is the velocity of the cart?
a. 1.6 m/s east
b. 0.9 m/s west
c. 1.1 m/s west
d. 1.6 m/s west

Explanation:

Q1

Velocity is speed with direction. Here, the train's movement is given with a direction (North), so it's velocity. Speed is just magnitude. Acceleration is rate of change of velocity. Since it's speed with direction, it's velocity.

Answer:

A. Velocity

Q2

Step1: Use speed formula \(v=\frac{d}{t}\)

Given \(d = 9000\) meters, \(t=12\) seconds.
\(v=\frac{9000}{12}\)

Step2: Calculate the value

\(\frac{9000}{12}=750\) m/s. Options A and B are in seconds (wrong unit for speed). Option D calculation: \(9000\times60\times60\div12 = 2700000
eq108000\).