Question

A car travels a distance of 900 m with 30 m/s and next 400 m with 20 m/s along a straight road. The average speed of the car will be

A. 26 m/s
B. 14 m/s
C. 28 m/s
D. 42 m/s

Answer 1

Answer:

A) 26 m/s

Explanation:

Average speed  = total distance travelld / total time taken

time taken to travel 900 at 30 m/s is

time = distance / speed

= 900/30 = 30 sec

time taken to travel 400 at 20 m/s is

time = distance / speed

= 400/20 = 20 sec

hence average speed is

= (900+400)/(30+20)

=1300/50

=26 m/s

answer is option A) 26 m/s