Question

Select the correct answer.
An athlete is running at a constant velocity with a javelin held in his right hand. The force he is applying on the javelin as he carries it is 5.0 newtons. If he covers a distance of 10 meters, what work has he done on the javelin?

A.
5.0 × 101 joules
B.
4.5 × 101joules
C.
-5.0 × 101 joules
D.
0 joules

Answer 1

Explanation:

Select the correct answer.

An athlete is running at a constant velocity with a javelin held in his right hand. The force he is applying on the javelin as he carries it is 5.0 newtons. If he covers a distance of 10 meters, what work has he done on the javelin?

A.

5.0 × 101 joules

B.

4.5 × 101joules

C.

-5.0 × 101 joules

D.

0 joules

Answer 2

Answer:

0 joules

The actual formula of finding the work is

W = F × S cosa, a is the angle in which the bearer is carrying the javelin.

or, W = 5 × 10 cos90, angle is 90 with the vertical component of the force [ study in class 11]

or, W = 0, cos90 = 0 ,therefore 5×10×0=0,

Hence work done in joules is 0 joules.Thank you.And if you like u can follow me and ask doubts whenever u need.