Question

The average speed of an object over a given time duration is 6 m/s.if it travels first half of the duration with a constant speed 4 m/s,its speed during the next half duration is-?
(please answer in steps) ​

Answer 1

Answer:

8m/s

Explanation:

the first half was travelled at a constant speed of 4m/s.

now we know that the average speed was 6m/s.

now to attain that average the speed needed would be:-

let it be x

therefore total average speed=6m/s

for half the distance the average speed=4

now we know that the distance is in 2 parts

one travelled in 4m/s and another by xm/s

therefore 4+x/2=6

which implies that

4+x=2×6

which implies that

4+x=12

which implies that

x=12-4

therefore

x=8

therefore the speed required for the other half is x