If a car accelerates at 7.5 mph/s, what would be its final speed after 5.0 seconds if its
1 answer:
Answer:
87.5mph
Explanation:
Given parameters:
Acceleration = 7.5mph/s
Starting speed = 50mph
Time = 5s
Unknown:
Final speed = ?
Solution:
Acceleration is defined as the rate of change of velocity with time:
Acceleration =
Insert the parameters and solve;
7.5 =
Final speed - 50 = 7.5 x 5
Final speed = 7.5 x 5 + 50 = 87.5mph
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The final speed is
Why?
To calculate the final speed, we need to know that we are working with an inelastic collision, it means that both bodies stick together after the colission. We can calculate the final speed of the bodies (if exists) using the following equation:
We are given the following information:
So, substituting and calculating, we have:
Hence, the final speed is 1.09 m/s.
Have a nice day!