Can work done by a force be negative

plzzz help me

Yes,

Explanation:

.If the force has a component in the direction opposite to the displacement, the force does negative work.

0.19 m/s and 0.45 m/s

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.