The body moves on a horizontal surface without friction. Before the body stopped in 25 s

| May 30, 2021 | education

The body moves on a horizontal surface without friction. Before the body stopped in 25 s, it moved with an acceleration of 0.4 m / s ^ 2. Calculate the speed of the body when it starts to brake.

t = 25 s
a = 0.4m / s ^ 2
V = 0 m / s
V0-?
For rectilinear uniformly accelerated motion, the formula defining the body acceleration a = (V-V0) / t is valid. Since the final velocity V is equal to 0, the body has stopped, the formula will have the form a = -V0 / t. The minus sign means that the speed of the body decreases, the body slows down. The minus sign shows the directions of acceleration, acceleration is directed against the direction of travel. a = V0 / t, V0 = a * t, V0 = 0.4m / s ^ 2 * 25 s = 10 m / s.
Answer: the speed of the body was 10 m / s.



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