Arock is thrown 0.8 meters into the air. how fast was it thrown?

Why do astronauts in the space shuttle weigh less?

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit

The ph is the a.independent variable b.the dependent variable c.control group