You throw a 2 kg ball upward with an initial speed of 20 m/sec. About 4 seconds later, the ball returns and you catch it. Next, you throw a 4 kg ball up with the same initial velocity and from the same location as the 2 kg ball. How does the time in the air for the two objects compare?

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.