particle moves along a straight line with an acceleration described by equation a=-8s^-2 where a is in m/sec^2 and s in meter. When t= 1 sec, s= 4 m and v=2 m/sec. Determine the acceleration when t = 2 seconds
Question
particle moves along a straight line with an acceleration described by equation a=-8s^-2 where a is in m/sec^2 and s in meter. When t= 1 sec, s= 4 m and v=2 m/sec. Determine the acceleration when t = 2 seconds
Solution
To determine the acceleration when t = 2 seconds, we can use the equations of motion.
Given that the acceleration is described by the equation a = -8s^-2, we need to find the value of s at t = 2 seconds.
To do this, we can use the equation v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.
Given that at t = 1 second, s = 4 m and v = 2 m/sec, we can substitute these values into the equation to find the initial velocity u.
2 = u + (-8)(4^-2)(1) 2 = u - 8
Simplifying the equation, we find that u = 10 m/sec.
Now, we can use the equation s = ut + (1/2)at^2 to find the value of s at t = 2 seconds.
s = (10)(2) + (1/2)(-8)(4^-2)(2^2) s = 20 - 2
Therefore, at t = 2 seconds, s = 18 m.
Now, we can use the equation v = u + at to find the acceleration a at t = 2 seconds.
2 = 10 + a(2) 2 - 10 = 2a -8 = 2a
Simplifying the equation, we find that a = -4 m/sec^2.
Therefore, the acceleration when t = 2 seconds is -4 m/sec^2.
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