Sagot :
Answer:
Total distance travelled in going and coming back
D = 30m + 30m = 60 m
Total time taken in going and coming back
t= 1 min + 1.5 min =2.5 min
= 2.5 60 s
= 150 s
Average speed = \frac{totaldis\tan ce\ \ travelled}{total\ time\ of\ travel}=\ \frac{60m}{150s}
total time of travel
totaldistance travelled
=
150s
60m
=0.4 m\ s^{-1}m s −1
Explanation: