Question 1 of 32 If a crane worker lifts a crate with a mass of 250 kg from the ground to a
shipping container that is 20 meters off the ground, by how much has the
worker increased the gravitational potential energy of the crate? (Recall that g
= 9.8 m/s2)
A. 83,000 J
B. 61,000 J
C. 49,000 J
D. 75,000 J
SUBMIT

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

it is called kinetic energy