Answer:
A
Explanation:
It is less than the acceleration of the backpack because abs has a greater mass.
Assuming that the gravitational field strength is 10 N/kg, the sum would look like this:
PEg=mgh
=60×10×10
=6000J
However, you will need to check that you are not meant to be using 9.8 N/kg as the gravitational field strength.
Explanation:
KE is directly proportional to the square of velocity / speed.
if speed is 2 times (doubled) the KE will be
![{2}^{2}](https://tex.z-dn.net/?f=%20%7B2%7D%5E%7B2%7D%20)
= 4 times the original KE
![4 \times (30)](https://tex.z-dn.net/?f=4%20%5Ctimes%20%2830%29)
![= 120 \: j](https://tex.z-dn.net/?f=%20%3D%20120%20%5C%3A%20j)