Question

an object travels with a speed of 10 m/s for ,15 seconds and then with speed of 15 m/s for 10 seconds • find average speed

Answer 1

10m/s in 15 sec i.e d1=150m
15m/s in 10 sec i.e d2=150m
hence 300m in 25 sec.
Therefore avg. speed is 12m/s

Answer 2

V1=10m/s
V2=15m/s
T1=15s
T2=10s
S1=V1×t1
=10×15
=150m
S2=V2×T2
=15×10
=150m
Average speed=s1+s2÷t1+t2
=150+150÷15+10
=300÷25
=12m/s


Hope it helps u