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seraphim [82]
3 years ago
10

particle has a constant acceleration of 5.8 m/s2. (Due to the nature of this problem, do not use rounded intermediate values in

your calculations—including answers submitted in WebAssign.) (a) If its initial velocity is 2.1 m/s, at what time (in s after t = 0) is its displacement 4.0 m? (No Response) 0.867 s (b) What is its speed at that time (in m/s)? (No Response) 7.13 m/s
Business
1 answer:
vova2212 [387]3 years ago
5 0

Answer:

a) t = 0.86 sec

b) v = 7.128 m/s

Explanation:

Given data:

Constant acceleration = 5.8 m/s^2

Initial velocity = 2.1 m/s

Displacement = 4.0 m

kinematic equation is given as

X -X_o = v_o \times t + \frac{1}{2} at^2

X- X_o =  4.0 m

v = 2.1 m/s

a = 5.8 m/s^2

plugging all value in the above relation

4 =  2.1t + \frac{1}{2} 5.8t^2

2.9t^2 + 2.1t - 4 = 0

solve for t

t = \frac{-2 \pm \sqrt{2.1^2 -(4\times 2.9 \times (-4)}}{2\times 2.9}

t = 0.86 sec

b)  kinematic equation relating to velocity is given as

v = v_0 + at

solving for velocity

v = 2.1 + 5..8\times 0.867

v = 7.128 m/s

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