Question

The car moves a distance of 200m it covers the first half of the distance at a speed of 40km/hr and second half of distance at speed v the average speed is 48 km/hr calculate the value of v

Answer 1

Avg speed = total distance/total time

Answer 2

Answer:60km/hr

Explanation:

48= 200/((100/40)+(100/v) )

or 1/40+1/v= 2/48=1/24

or 1/v=1/24-1/40=2/120=1/60

or v=60km/h

[Alt: v_av = (2v_1 v_2)/(v_1+v_2 ) => 48= (2×40×v)/(40+v) => v=60 km/h]