In a weightlifting competition, Jenna does 150 Joules of work in 3 seconds. How much power did she use?

50 W

Explanation:

By definition, power is the rate at which work is done or of transferring heat, i.e. the amount of energy transferred or converted per unit time. Its unit is Watt or J/s.

Mathematically,

Power = workdone/time

Given:

Workdone = 150 J

Time = 3 s

Power = 150/3

= 50 W.

f=gm1m2/d^2 it d

f is force g is gravitaiton constant, m1 is mass of first object, m2 is mass of second object. d is distance between two object

the answer is a. at the equator