Jane drives at an average speed of 45 mph on a journey of 135 miles. How long does the journey take? Solution

Usually, Tony travels to Bunbury from Perth city in 2.50 hours. One day he increases his average speed by 12.0 km/h and takes 22.5 minutes less time to reach Bunbury. (a) What was his usual average speed? What was the distance travelled? (b) On the way he stopped at a rail crossing (6.00 m wide) and a train (total length 144m) decelerating at -0.585 ms2 just entered the crossing with a velocity of 13.7 m s¹. Sketch a diagram and find the minimum time for the last carriage of the train to clear the crossing.

A car accelerates from 14.58 km/h to 58.64 km/h in 2.8 seconds.  What is the value of the acceleration?

A student drives the 105-mi trip back to campus after spring break and travels with an average speed of 63 mi/h for 1 hour and 30 minutes for the first part of the trip. (a) What distance was traveled during this time? Answer: 94.5 mi (b) Traffic gets heavier, and the last part of the trip takes another half-hour. What was the average speed during this leg of the trip?   (c) Find the average speed for the total trip.