A car traveling with constant speed travels 150 km in 7200 s. what is the speed of the car?
Asked by maham237 @ in Physics viewed by 498 People
Express the speed to two significant figures and include the appropriate units
Asked by maham237 @ in Physics viewed by 498 People
Express the speed to two significant figures and include the appropriate units
Answered by maham237 @
The speed of the car is 75 km/h
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 with constant speed.
We could also plot the distance vs time graph as shown in the attachment.
Grade: Middle School
Subject: Physics
Chapter: Kinematics
Keywords: indycar top speed of a fastest police car has ever gone
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