Question

8. An ant goes in a straight line towards the
sugar cube and returns back to the starting
point. Is the acceleration zero at the turning
point, if its speed does not change?​

Answer 1

Answer:

no

Explanation:

at a constant speed(meaning no change in the magnitude of the velocity) an object could be changing its direction, and thus, accelerating. On the other hand, a constant velocity means nochange in velocity (both magnitude and direction), so in this case the acceleration must be zero (no acceleration).

Answer 2

Answer:

Consider the distance from the starting point to the sugar cube to be x

Acceleration is the rate of change of velocity.

If the ant maintains the same velocity through the the journey the velocity at the turning point will be equal but the dicerarional vector of the two velocities will be in opposite directions.

Let the velocity be v

Then,

Velocity before turning = v

Velocity after turning = -v

Acceleration ,

a = (v+-v)/t

a = 0/t

a = 0

Therefore the velocity of the ant at the turning point is zero.