If the acceleration of an object is zero at some instant in time, what can be said about its velocity at that time? 1. it is negative. 2. it is positive. 3. it is not changing at that time. 4. unable to determine. 5. it is zero.

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