3. daniel stands on a bridge over a river. he drops a coin and notes that the coin takes 3 s to reach the river below.
he must be standing
above the river.
a 10 m
b. 15 m
c. 30 m
d. 45 m

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d