Question

2. Transportation A car at rest begins traveling at a constant acceleration of 18 feet per second per second (18ft/sec

2
). After 6.0sec, the car is traveling at 108ft/sec. Convert this final speed to miles per hour. (Round to two significant digits.)

Answer 1

To convert the final speed of the car from ft/s to mph we must know the unit conversions.

Explanation:

Conversion: Conversion involves changing a quantity from one unit to another. In this problem, we convert the car's final speed from feet per second to miles per hour.

To convert the final speed of 108 ft/sec to miles per hour, we'll follow these steps:

Step 1: Convert feet to miles

1 mile = 5280 feet

`((108ft)/(1s))((1mile)/(5280ft)) = 0.0204545 miles/s`

Step 2: Convert seconds to hours

1 hour = 3600 seconds

`(0.0204545 miles/s)((3600s)/(1h)) = 73.637 miles/hour`

Answer: Rounding the final result to two significant digits, the car's final speed is approximately 74 miles per hour.