Using the voltage meter, you should find that 1 m away from the charge, the voltage is 9 V. What is the voltage 2 m away from the charge?

v2 = 4.5v

Explanation: The potential difference (v) and distance (r) from any arbitrary point have an inverse relationship.

That's voltage is inversely proportional to distance.

v = k/r

Hence, we have that

v1 * r1 = v2 * r2

v1 = 9v, r1 = 1m, v2=?, r2 = 2m

9 * 1 = v2 * 2

9 = 2 * v2

v2 = 9/2

v2 = 4.5v

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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grav forces affect all objects magnetic forces affect magnetic objects and electric currents