The amount of work done by two boys who apply 310 n of force in an unsuccessful attempt to move a stalled car is

1. 310 n · m.
2. 620 n.
3. 310 n.
4. 0.5.620 n · m

0 N-m

Explanation:

Given

Force applied is given by

It is given that there is no movement of car

therefore Net displacement is zero i.e.

Work done is given by

it becomes positively charged by charging it

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.