Answer:
10kg
Explanation:
Let PE=potential energy
PE=196J
g(gravitational force)=9.8m/s^2
h(change in height)=2m
m=?
PE=m*g*(change in h)
196=m*9.8*2
m=10kg
Friction occurs when the surfaces and heat of two surfaces grind against each other.
I think these are the answers
Build a filter.
Dig water from the ground
Answer:
The purpose of report : Reports communicate information which has been compiled as a result of research and analysis of data and of issues .
The formula for average speed is

So we can just substitute our data.

- its the result