Question

12. A car moves towards north at a speed of 54 km/h
for 1 h. Then it moves eastward with same speed
for same duration. The average speed and velocity
of car for complete journey is
15
(1) 54 km/h, o
(2) 15 m/s, va
m/s
km/h​

Answer 1

Explanation:

54km/hr

average speed = total distance / total time

time = d/ s

Answer 2

Average speed is the ratio of the total distance travelled by the car and the total time taken,

Speed

avg

=

t+t

15t+15t

(∵54km/s=15m/s)

or, Speed

avg

=15m/s

Average velocity will be the ratio of displacement and time.

The car moves north first and then east. The shortest distance will be the hypotenuse of the triangular path.

v

avg

=

t+t

15

2

t

or, v

avg

=

2

15

2

or, v

avg

=

2

15

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