A racecar driver speeds up from 60 miles per hour to 90 miles per hour in 3 seconds. What was his/her acceleration in mph/sec?
Choose the best answer from the options below:
A 10
B 20
C 30
D 40
E 50
To find the acceleration, we can use the formula:
acceleration = (change in velocity) / (change in time)
The change in velocity is 90 - 60 = 30 mph, and the change in time is 3 seconds.
acceleration = 30 mph / 3 sec = 10 mph/sec
Therefore, the acceleration in mph/sec is 10.
The correct answer is A.
To calculate acceleration, we can use the equation:
Acceleration = (Final Velocity - Initial Velocity) / Time
The initial velocity is 60 mph, the final velocity is 90 mph, and the time is 3 seconds.
Acceleration = (90 - 60) / 3
Acceleration = 30 / 3
Acceleration = 10 mph/sec
So, the correct answer is A) 10.