A Drag Racer Starts From Rest And Accelerates At 8.0 M/S2 For The Entire Distance Of 400 M (1/4 Mile). What Is The Speed Of The Race Car At The End Of
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?
Answer:
The speed of the race car is 80 m/s
Explanation:
Here, we are going to solve for the speed of the race car at the end of the run or its final velocity. In this problem, we are going to use the concept of Straight line motion.
For the formula, we will use:
V² = Vo² + 2as
where
V is the final speed of the race car, unit is in m/s
Vo is the initial speed of the race car, unit is in m/s
a is the acceleration, unit is in m/s²
s is the entire distance traveled by the race car, unit is in meter, m
For the given information
Vo = 0 because it starts from rest
a = 8 m/s²
s = 400 m
V = ?
Solving the problem
V² = Vo² + 2as
V² = 0 + 2(8 m/s²)(400 m)
V =
V = 80 m/s
Therefore, the speed of the race car at the end of the run is 80 m/s.
To learn more about this topic, click the following links:
- Additional example with solution and answer
- Definition of final velocity
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