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DanielleElmas [232]
2 years ago
8

A car that travels from point A to point B in four hours, and then from point B back to point A in six hours. The road between p

oint A and point B is perfectly straight, and the distance between the two points is 240 km. What is the car’s average velocity?
Physics
2 answers:
Hitman42 [59]2 years ago
3 0
Note : Be careful with speed and velocity, even the formula is same that v =  \frac{x}{t}

1. If we would like to find the velocity, we must calculate the distance from initial to final, x_{f} -  x_{i} = (delta)x,

2. If we would like to find the speed, we must calculate the total distance that travelled (x_{total}.

So, in this question, because it return back to its initial point so (delta)x = 0, so average velocity is 0 m/s.
cestrela7 [59]2 years ago
3 0
If you mean average speed, it is 480/10 = 48 kn/h

If you mean average velocity, it is 0/10 = 0 km/h
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F is inversely proportional to the distance between charges.

If the distance is halved, d'=(d/2), new force is given by :

F'=k\dfrac{q_1q_2}{d'^2}\\\\=k\dfrac{q_1q_2}{(\dfrac{d}{2})^2}\\\\=k\dfrac{q_1q_2}{\dfrac{d^2}{4}}\\\\=4\times \dfrac{kq_1q_2}{d^2}\\\\F'=4F

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B. 450 feet

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