Aforce is always needed to keep an object moving.

a. true
b. false

A12-kg bag of groceries is tossed onto a table at 4.0 m/s and slides to a stop in 2.2 s . modify the equation fδt=δ (mv) to find the force of friction.

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car