Lisa F asked in Science & MathematicsPhysics · 1 month ago

# a car maintains its speed of 25 m/s as it travels from point A to point B in time of 8 s, what is the average acceleration?

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• ?
Lv 5
1 month ago

I think this is meant as a trick question to see if you are paying attention to the wording.

It says that is maintains its speed as it travels from point A to point B. If the speed is 25m/s at point A and 25m/s at point B then the average acceleration is 0m/s during that 8s span.

• NCS
Lv 7
1 month ago

acceleration = change in velocity / 8s

Acceleration and velocity are both vectors, so this must be kept in consideration. For instance, if the car makes a U-turn between points A and B, the acceleration has magnitude

(25 - -25)m/s / 8s = 6.25 m/s²

• ?
Lv 7
1 month ago

On curved path : a = V^2/r

on  straight path r → ∞ and a  → 0   whichever is V

• Zirp
Lv 5
1 month ago

if it travels in a straight line, zero

If it orbits a planet, it's not zero

• 1 month ago

Please do not imagine that the acceleration is zero.  This may not be true.

We cannot know the answer.  SPEED IS NOT VELOCITY.  If the car is changing direction its velocity alters but its speed does not.

We can only give the acceleration for this problem if we know that the car does not change its direction during the motion.  The magnitude of the acceleration must lie between 0 and 50/8 = 6.25 m/s

I am surprised that Bill and az_lender have not spotted this detail.  They are both good responders.

• 1 month ago

zero, constant speed ("maintains") is zero acceleration.

• 1 month ago

There is no acceleration as the car "maintains" its speed.