Gravity pulls downward on a rock with a force of 800 n. if you pull upward on the rock with a force of 400 n, what is the total force acting on the rock?

a. 400 n downward
b. 400 n upward
c. 1200 n downward
d. 1200 n upward

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Using proper grammar, spelling, and punctuation, write at least one 5 sentence paragraph describing 3 ways we use the elements of the electromagnetic spectrum (ems) in our everyday lives.

What factor gives citizens' groups influence over legislators on environmental issues? question 4 options: they can give interviews to the media. their members vote in elections. they have a great deal of money. their leaders can run for office.