The speeds of a car travelling on a straight road are given below at successive intervals of
1 second.
Time/s 0 1 2 3 4
Speed/m/s 0 2 4 6 8
Calculate
a the average speed of the car in m/s [2]
b the distance the car travels in 4 s [3]
c the constant acceleration of the car. [2

Need only answer if you think you know it

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.