What does it mean when work is positive? velocity is greater than kinetic energy. kinetic energy is greater than velocity. the environment did work on an object. an object did work on the environment.

As we know by work energy theorem

Work done by all forces = change in Kinetic Energy

here if work done is positive then it means change in kinetic energy will be positive

So work is done on the object which will increase the kinetic energy of that object.

So here to increase the speed we can say that the surrounding is doing some work on it which will increase the speed.

So here correct answer must be

The environment is doing work on it.

C

Explanation:

the area between the graph and the t axis

it is b. absorbs thermal energy