Chi walked 100 meters in 5 minutes. she took another 15 minutes to walk another 400 meters to reach her house. what is her average speed?

Average speed is the ratio of total distance moved by Chi in total time interval

So here we will have

Total distance = 100 m + 400 m

Total time taken = 5 min + 15 min = 20 min

now by the formula of average speed we know that

so average speed will be 1.5 km/h

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it