The ball begins to move along an inclined groove from rest with a constant acceleration
May 29, 2021 | education
| 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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