What what are the si units for average speed?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Acar is traveling 35 mph on a smooth surface . if a balanced force is applied to the car what happens?