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What will be its instantaneous velocity?

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2 Answers

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 :)