Question

a car cover 1st half distance at speed of 40 km per hour and second half with 80 km/hr find average speed of car​

Answer 1

Answer:

1st half:

we know that

speed = distance / Time

40 = distance /1

40/1 = distance

or, distance= 40 km/h

2nd half:

80 = distance/ 1

so, distance = 80 km/h

Now average speed = Total Distance / Total time taken

av. = 40+80 / 1+1

av. = 120/2

av. = 60km/h

Either you can convert it in m/sec or you can leave it as it is.

But it would be preferable to change it in SI unit.

60/3.6 m/sec

600/36 m/sec

16.66 m/sec. Ans

This is the complete answer

Hope it helped you.....