Question

As block falls through the air by 40 m it does work equal to -1800 J. Determine the mass of the block

Answer 1

Answer:

By the end of this section, you will be able to:

Explain gravitational potential energy in terms of work done against gravity.

Show that the gravitational potential energy of an object of mass m at height h on Earth is given by PEg = mgh.

Show how knowledge of the potential energy as a function of position can be used to simplify calculations and explain physical phenomena.

Answer 2

Answer:

4.5

Explanation:

because w=f×s -1800=f×40

f=45

by Newton's 2nd law F=ma

45=m×(10) because It is falling f=w

m=45÷10=4.5