The answer is 20km because you go to yours friend's house and back then an extra 10km. 5+5+10=20km
Answer: 800 km/h
Explanation:
Use equation for average speed
V=S/t
where S is distance
t is time
S=4800Km
t=6h
---------
V=S/t
V=4800Km/6h=800 Km/h
Answer:
PE=0
Explanation:
If the tank is on the ground, there is 0 height which means the equation of PE=mh will be PE=12543(0)=0, hope this helps!
If the distance between you and the source is increasing, then
you'll hear a sound with a lower pitch than the sound the source
is actually making. Either you're moving away from the source,
or the source is moving away from you.