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?

sailboats-sail

#1

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