Posted by **Amanda and Leah** on Wednesday, December 7, 2011 at 10:02pm.

In starting an exercise, a 1.60-m tall person lifts a 2.10 kg book from the the ground so it is 2.20m above the ground. What is the potential energy of the book relative to (a) the ground,and(b) the top of the persons head? (c) What is the work done by the person in part(a)?

- Physics -
**Ash**, Thursday, October 24, 2013 at 11:37pm
(a) From ground, h=2.30m so:

PE=mgh

=1.70kgx9.8m/sx2.30m

= 38.3J

(b)The person is shorter than the distance at which he holds the book from the ground so:

2.30-1.60=0.7m Use the same formula, just substitute 0.7 in for h.

(c)The work in this case is the potential energy of the book relative to ground, so it is equal to answer a.

## Answer this Question

## Related Questions

- Physics - A classmate throws a 1.1-kg book from a height of 1.3 m above the ...
- Physics - A classmate throws a 1.1-kg book from a height of 1.3 m above the ...
- physics- please explain - Why is the following situation impossible? A librarian...
- physics- TEST TMRW PLS HELP! - Why is the following situation impossible? A ...
- physics - A 3kg book is lifted to a height of 50cm above the ground (a)by how ...
- physics - A 0.662-kg basketball is dropped out of a window that is 6.32 m above ...
- physics - A 0.582-kg basketball is dropped out of a window that is 5.98 m above ...
- physics - A 0.582-kg basketball is dropped out of a window that is 5.98 m above ...
- Physics 2 - A 0.564-kg basketball is dropped out of a window that is 5.85 m ...
- Gen physics - A 0.662-kg basketball is dropped out of a window that is 6.32 m ...

More Related Questions