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

July 26, 2021 | education

| **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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