I believe the answer is D
V=at and a=F/m
140/.070 = 2000m/s^2
2000*.020 = 40m/s
The ball’s velocity increased by 40m/s.
Answer:
9800 Pa
Explanation:
Data: pressure-?
Force- mass ×acceleration
= 50× 9.8m/s^2
=490N
Area= 500cm^2=0.05m^2
pressure= force/ area
p=F/A
P= (490N)/( 0.05m^2)
=9800 Pa
Answers:
a) 
We know the Earth's surface area in square miles is:

On the other hand, we know
.
Then:

b) 
In this part, we can work with the obtained value in part a:

And knowing 
Hence:

c) 
Knowing
:
