Question

A car travel 60km/h during the first hour and 30km/h during the next hour what is its average speed during two hour

Answer 1

HEY MATE! HERE'S YOUR ANSWER.

→SPEED OF CAR DURING 1ST HOUR=60KMPH
→LET THE TIME BE 1 HOUR
→DISTANCE=SPEED / TIME
→DISTANCE=60KM

→SPEED OF CAR DURING 2ND →HOUR=30KMPH
→LET THE TIME BE 1 HOUR
→DISTANCE=SPEED/TIME
→DISTANCE=30KM

→TOTAL DISTANCE=60+30
=90KM
→TOTAL TIME=2HOURS
→AVERAGE SPEED=90/2
=45KMPH

Answer 2

$average \:speed= \frac{v+u}{2}$

$average \:speed= \frac{60+30}{2}$

$av = 45km/h$

on converting to m/s

$45× \frac{5}{18}$

$av=12.5 m/s$