Answer :

Greatest speed will be experienced when ball will just reaching the bottom ground, as at time all the potential energy will be completely converted to kinetic energy hence maximum speed will be experienced

Smallest speed will be at highest point, as only single component will be present at time (horizontal), therefore at that time vector sum of velocity will be lowest.

Acceleration is only due to gravity; hence it will remain constant throughout (if we are not considering air drag as this will convert it into non-uniform motion)

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