Question

A hockey puck is hit on a frozen lake and moving with a speed of `13.7` `m``/s`. Seven seconds later, its speed is `7.2` `m``/s`. What is its average acceleration?

Answer 1

`a=-0.93m/s`

Explanation:

given,
`v=7.2m/s`
`u=13.7m/s`
T=5s
so acceleration

`a=(v-u)/t`
`a=(7.2-13.7)/7`
`a=-0.93m/s`