What term is used to denote the change of velocity with time?

Write the formula for acceleration. Give the meaning of each symbol which occurs in it.

A train starting from railway Station attains a speed of 30 m/s in one minute. Find its acceleration.

Give one word which means the same as ‘moving with a negative acceleration”.

The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero? Give reason for your Answer