A car traveling at constant speed travels 150 km in 7200 s. what is the speed of the car? Express the speed to two significant figures and include the appropriate units?
Answer:
The speed of the car is 75 km/h
Further explanation
These are the formulas that we have to remember before solving the problem.
Speed is the rate of change of distance.
v = speed ( m/s )
d = distance ( m )
t = time ( s )
Acceleration is the rate of change of velocity.
a = acceleration ( m/s² )
Δv = change in speed ( m/s )
t = time ( s )
Let us now tackle the problem!
Given:
distance = d = 150 km
time taken = t = 7200 s = 2 hours
Unknown:
velocity = v = ?
Solution:
The acceleration of the car is 0 m/s² because it travels at a constant speed.
We could also plot the distance vs time graph as shown in the attachment.
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