**A sailboat increases its speed from 1 m/s to 4 m/s in 3 seconds. What will the speed of the sailboat be at 6 seconds if the acceleration stays the same ?**

**Answer:**

Initial speed u = 1m/s

Acceleration = change in speed /time

a = (4-1)/3 = 1 m/s^2

at t = 6 sec speed v = ?

by law of motion

v = u +at

v = 1 + 1*6

v = 7 m/s