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A block of mass 3 kg initially at rest is pulled along a friction less horizontal surface with a force of 4N.

A block of mass 3 kg initially at rest is pulled along a friction less horizontal surface with a force of 4N. The speed of the block at t=2s is
a)4/3 m/s
b)8/3m/s
c)4 m/s
d)8m/s
e)24m/s
For this problem this is a graph. Some of the points on the graph are (0,0),(1,2),(2,4),(3,6) where the x's is the time and the y's is the Force. I know that v=d/t but they don't give us time. Please help me.The acceleration is a = F/m = 4/3 m/s^2
The velocity after 2 s is (1/2)at^2 =
(1/2)(4/3)(4) = ?
The answer is one of the multiple choices.

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