A weight lifter lifts a dumbbell a certain height in 2.0 s, while a competitor does the same workin 1.0 s. Compared to the power developed by the first weightlifter, the power developed by thesecond is? a. one-half as great b. twice as great c. the same d. 4 times as great

a. one-half as great

Explanation:

The power developed by the first lifter is one-half as great as that of the second person.

  Power is defined as the rate at which work is done;

          Power  =

Since the two lifters do the same work at different time, let us estimate their power;

       P₁ =                     P₂ =

   We see that for P₁, power is half of the work done whereas in P₂ power is the same as the work done.

Therefore,

           The power of the first weight lifter is one-half the second lifter.

come closer and become far apart and become steam/gas

the bal will not change its velocity.