A car covers 72 kilometers in the first hour of its journey. In the next hour, it covers 90 kilometers. What is the amount of work done by the car? The total mass of the car, including its passengers, is 2. 5 Ă— 103 kilograms. A. 2. 8 Ă— 105 joules B. 4. 0 Ă— 105 joules C. 5. 1 Ă— 105 joules D. 2. 8 Ă— 106 joules E. 2. 8 Ă— 107 joules.

the answer is c i did the same question so i know that's right!

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.