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brandonthomas11
10.03.2020 •
Physics
A particle whose mass is 3.0 kg is pushed along the x-axis with a time-varying force given by: F = 6.0 t2 − 2.0 t + 4.0. At t = 0, the particle is moving at a speed of 15 m/s. How fast (speed) is the particle moving at t = 3.0 s? ( F is in newton and t is in second)
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Ответ:
Explanation:
We know that the acceleration a = F/m
As the force is a function of time, it varies with time,![a(t) = F(t) /m](/tpl/images/0540/4460/e573a.png)
The mass is constantThe velocity at t = 3 seconds is expressed as an integral of acceleartion over time, which is represented as
V (t=3) = 19+15 = 34 m/s
Ответ: