Estimate the average speed of the apollo spacecaft in m/s, given that the craft took five days to reach the moon from eaeth .the moon is 3.8*10 to the power 8m from earth.

Question

Estimate  the  average  speed  of  the  apollo  spacecaft  in  m/s, given  that  the  craft  took  five  days  to  reach  the  moon  from  eaeth  .the  moon is 3.8*10 to the  power  8m from  earth.

bobpursley · Accepted Answer

ESTIMATE
distance=400M m
time=5*24=120hrs*3600sec/hr=about 3.6*.12 sec=about .42E6sec

so speedabout=900m/s
about means I rounded and calculated in my head. It is an estimate.

Now more accurately
speed=380E6/(5day*24hr/day*3600sec/hr)

speed=380E6/(5*24*3600)=880 m/s