The ball begins to move along an inclined groove from rest with a constant acceleration

The ball begins to move along an inclined groove from rest with a constant acceleration of 2 cm / s2. What path will the ball take in the third second?

а = 0,02 м/с^2.

V0 = 0 м/с.

t1 = 2 с.

t2 = 3 с.

S – ?

При движении с постоянным ускорением a пройдённый телом путь S определяется формулой: S = V0 *t + a *t^2/2, где V0 – начальная скорость движения, t – время движения.

Так как V0 = 0 м/с, то формула примет вид: S = a *t^2/2.

Найдём пройдённый путь за t1 = 2 с и t2 = 3 с.

S1 = a *t1^2/2, S2 = a *t2^2/2.

S1 = 0,02 м/с^2 *(2 с)^2/2 = 0,04 м.

S2 = 0,02 м/с^2 *(3 с)^2/2 = 0,09 м.

S = S2 -S1.

S = 0,09 м – 0,05 м = 0,04 м.

Ответ: за третью секунду тело пройдет путь S = 0,04 м.



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