NEED HELP! An astronaut, visiting a newly discovered planet, finds the acceleration due to gravity by dropping an object
from a height of 1.0 meter and measuring how long it takes the object to hit the ground. If it takes the object
0.8 seconds to hit the ground, what is the acceleration due to gravity on this planet?
A. 3.1 m/s2
B. 2.5 m/s2
c. 1.6 m/s2
D. 0.78 m/s2

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Ihave this 50 question test the layer of earth's atmosphere where atoms and molecules escape into space is referred to as the a) exosphere b) ionosphere. c) mesosphere d) thermosphere

Energy transformations that involve one transformation from one type of energy to another are called transformations.