An astronaut plays paddle ball in orbit. The ball is hit with a speed of 5.21 m/21 m/s in the positive direction and has an average negative acceleration of 4.5 m/s2. How long does it take for the ball to reach a final velocity of -3.2 m/s?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

How are series and parallel circuits simililar? both have multiple paths for electrons to travel. both require resistors in their circuits. both require a switch to complete the circuit. both have at least one path for electrons to travel.

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?