5. a family of ducks is swimming in a pond at a speed of 3 m/s when a gust of wind hits them. by the time they reach the other side of the lack, the ducks are moving at a speed of 7 m/s. how long did it take for them to cross the lake if they accererated at a rate of 1 m/s2

The time taken by the duck to cross the lake is, t= 4 s

Explanation:

Given data,

The initial speed of the ducks, u = 3 m/s

The final speed of the ducks, v = 7 m/s

The acceleration of the duck, a = 1 m/s²

The formula for the acceleration is,

                               a = (v - u) / t

∴                               t = (v - u) / a

Substituting the given values in the above equation,

                                t = (7 - 3) / 1

                                  = 4 s

Hence, the time taken by the duck to cross the lake is, t= 4 s

because growing process had stoped after 4-5 year