The dynamic friction coefficient between the object with mass m = 1kg and the horizontal plane is 0.5. Under the action of horizontal tension f = 10N, the object starts to move from static state, and (1) the object passes through 2.5m If the horizontal pulling force is removed when the object passes through 2.5m, how far can the object move

a=(F-f)/m==(F-umg)/m=5m/s^2
a'=f/m==umg/m=5m/s^2
V^2=2as=2*5*2.5m/s
V=5m/s
V^2=2a's'
s'=2.5m

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