1. An object moves along the x-axis according to the law s= + 2t2 – 1, 16 where s is in meters, t is in seconds. a. Find time t when the acceleration is zero; b. Calculate the object's velocity at this instant.

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First, we determine the position of the partic
x(t1) = x(2) = 2(2²) + 4 =
x(t2) = x(4) = 2(4²) + 4 = 36m
Compute the average speed in the given time interval:
x(t2) - x(t1)
36 12 24
Vave
t2 -t1
4 2
12 m/s
2
Evaluate
Time Duration: 1 hour)
Direction: Solve the following problems. Place your solution in a short bond
рaper.
1. An object moves along the x-axis according to the law s =
-는+2t2-1,
16
where s is in meters, t is in seconds.
a. Find time t when the acceleration is zero;
b. Calculate the object's velocity at this instant.
t3
2. The motion of a particle is given by the equation s = 2t*-+ 2t? where s is
in feet and t is in seconds. Compute the values ofv and a whent 2 sec.
16
3. A particles moves in a straight line according to the law s = t3 - 40t where
s is in feet and t is in seconds.
a. When t 5 sec, compute the velocity?
b. Find the average velocity during the fourth second?
C. When the particle again comes to rest, what is its acceleration?
Transcribed Image Text:First, we determine the position of the partic x(t1) = x(2) = 2(2²) + 4 = x(t2) = x(4) = 2(4²) + 4 = 36m Compute the average speed in the given time interval: x(t2) - x(t1) 36 12 24 Vave t2 -t1 4 2 12 m/s 2 Evaluate Time Duration: 1 hour) Direction: Solve the following problems. Place your solution in a short bond рaper. 1. An object moves along the x-axis according to the law s = -는+2t2-1, 16 where s is in meters, t is in seconds. a. Find time t when the acceleration is zero; b. Calculate the object's velocity at this instant. t3 2. The motion of a particle is given by the equation s = 2t*-+ 2t? where s is in feet and t is in seconds. Compute the values ofv and a whent 2 sec. 16 3. A particles moves in a straight line according to the law s = t3 - 40t where s is in feet and t is in seconds. a. When t 5 sec, compute the velocity? b. Find the average velocity during the fourth second? C. When the particle again comes to rest, what is its acceleration?
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