Saturday

December 20, 2014

December 20, 2014

Posted by **reenam** on Monday, January 11, 2010 at 4:54am.

- science -
**drwls**, Monday, January 11, 2010 at 6:49amYou have not asked a complete question.

If you want to know how much work he does moving the mass, it is -2kg *g *2m = -(4 kg*m)*g = -39.2 Joules

It is negative because he is letting "the force" (which is presumably the weight) push it in the direction of the gravity force.

**Answer this Question**

**Related Questions**

science - What is the acceleration of a boy on a skateboard is the net force on...

Science - what is the acceleration of a boy on a skateboard if the unbalanced ...

Calculus - Two points P and Q are connected by a straight road of length d. At ...

Physics - A boy on a 2.4 kg skateboard initially at rest tosses a(n) 8.2 kg jug ...

Physics - A boy on a 2.2kg skateboard initially at rest tosses a 7.9kg jug of ...

Science - A boy exerts a force of 15N to push a motor bike which has flat tyre ...

Science - A boy exerts a force of 15N to push a motor bike which has flat tyre ...

physical science - What is the acceleration of a girl on a skateboard if the The...

physics - 3 boys pulling at the end of 3 ropes held together on a knot. one boy ...

Physics concept question - A long straight horizontal wire carries a current I...