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