Question

A body is moving with 10m/s for first 15minutes and with the speed of 10km/h for next 15minutes find average speed of journey​

Answer 1

Answer:

Explanation:

average speed=total distance/total time taken=s1t1+s2t2/t1+t2

150+540/30=690/30=23m/sec

Answer 2

Answer:

The average speed of the journey is 23 km/h

Explanation:

FIRST CASE:

t = 15 min

= 900 s

v = 10 m/s

s = vt

900(10)

9000 m

9 km

SECOND CASE:

t = 900 s

v = 10 km/h => 25/9 m/s

s = 2500 m

2.5 km

Average speed : (9000+2500) ÷ (900+900)

=11500/1800

=115/18 m/s

Multiple it by 18/5 to convert it into km/h

= 23 km/h