Motion in a Straight Line - Result Question 6

6. A bus travelling the first one third distance at a speed of 10km/h, the next one third at 20km/ h and the last one-third at 60km/h. The average speed of the bus is

(a) 9km/h

(b) 16km/h

(c) 18km/h

(d) 48km/h

[1991]

Show Answer

Answer:

Correct Answer: 6. (c)

Solution:

(c) Average speed =ss/310+s/320+s/360

=ss/18=18km/h

In case speed is continuously changing with time, then, Vav=vdtdt



NCERT Chapter Video Solution

Dual Pane