# The body moves on a horizontal surface without friction. Before the body stopped after 25 seconds

The body moves on a horizontal surface without friction. Before the body stopped after 25 seconds, it moved with an acceleration of 0.4. Calculate the speed value of the body when it starts to brake.

To find the value of the speed of a given body at the moment of the start of braking, we will use the formula: V = 0 = Vn – a * t, from where we will express: Vn = a * t.

The values of the variables: a – constant acceleration during braking (a = 0.4 m / s2); t is the duration of movement until the stop (t = 25 s).

Calculation: Vн = a * t = 0.4 * 25 = 10 m / s.

Answer: At the moment of the start of deceleration, the given body had a speed of 10 m / s.

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