A 200 kg motorcycle is traveling at a high initial speed. Seeing a stopped truck in front of him, he applies his brakes and stopes the motorcycle distance of 45 meters in 3 seconds.
a What was the initial velocity of the motorcycle?

grav potential energy

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

electric field is a function of 1/r^2

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