Question

A van slows down as it travels up a steep hill. Its speed goes from 20m/s at the bottom of the hill to 12m/s when it reaches the top 8 seconds later. How far has the van travelled between the bottom and the top of the hill?

Answer 1

The van's AVERAGE speed up the hill is

1/2 (20+12) m/s

= 1/2 (32 m/s)

= 16 m/s.

Traveling for 8 seconds at an average speed of 16 m/s, the van covered

(16 m/s) • (8 sec) = 128 meters .