Question

If rocket is moving with constant speed what is its acceleration

Answer 1

Its acceleration would be 0 in this case because if you use the formula

a=(v-u)/t

where ;  a= acceleration,

             v= final speed

              u= speed at the start

              t= time

In this case v and u would be the same do when you subtract 2 numbers that are the same ( eg 5-5 ) the answer is always 0..