Calculating Work Done by a Child Pulling a Toy Car

[j doe]

Homework Statement

A child 1.52 meters tall pulled a 2.54 kg toy car for 10 meters. The car has a string attached to it, and when pulled creates a 25 degree angle from the horizon. If the string has a force of 123 N on it while being pulled, how much work did the child do?

Homework Equations

work = force x displacement

The Attempt at a Solution

W = (123 N)(10 m) cos(25 degrees) = 1114.8 J

is this correct? does the child's height have anything to do with the problem?

 

[Doc Al]

W = (123 N)(10 m) cos(25 degrees) = 1114.8 J

is this correct?

Yep! Good!

does the child's height have anything to do with the problem?

Nope. (Neither does the car's mass.)

 

[rpthomps]

Seems okay to me and no, the child's height is irrelevant.