Question

When an object is thrown upwards, what is true of velocity and acceleration at the highest point of motion of the object?

Answer 1

The highest point in the motion of the object is its Maximum height,from where the body falls down. It's velocity at that point is equal to zero and it's starts increasing its velocity as it falls. Acceleration is equal = -g while moving upwards and while moving downwards it is g.

Answer 2

when an object is thrown vertically upwards then at the highest point at what it will reach the velocity become zero and the positive acceleration that is of gravity is always act on it that is of 9.8 metre per second square
but at starting we are giving some initial velocity to the object that is opposite to the positive acceleration or Gravity so that acceleration will be negative hence we get the negative acceleration of-9.8 metre per second square that decrease its speed from the starting velocity to which its final velocity at the highest point of the motion of the object that becomes zero.
but after reaching at the highest point the acceleration again become 9.8 metre per second square because after reaching at the highest point the object again start move downward that is toward the gravity.

hence, at highest point. v=0m/s
a=9.8m/s^2
hope this is helpful to you as I have explained it briefly
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