What will be its instantaneous velocity?

Question

A row boat, starting from rest, takes 10 seconds to travel 28 meters. If the boat maintains a uniform acceleration, what will be its instantaneous velocity at the end of the 10 second period?

Answer 1

d = (1/2)at^2

28 = (1/2)a(10^2)

Solve for a,

a = .56 m/sec^2

 

v = at = .56*10 = 5.6 m/sec

 

 

Answer 2

 

Sun -- "physical" approach ... ave speed is 2.8m/s ... since Vo is zero, Vf must be twice or 5.6 m/s :)