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Aleksandr-060686 [28]
2 years ago
7

Bài 4: Một vật dao động điều hòa với phương trình x = 4cos(4πt - π/3) cm.

Physics
1 answer:
ra1l [238]2 years ago
6 0

Answer:

g

Explanation:

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A car traveling at 14 m/s accelerates at 3.5 m/s² for 5 seconds. How much distance does it travel during that time?​
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Answer: 113.75

Explanation:

You know

acceleration = a = 3.5 m/s²

time = t = 5 seconds

initial velocity = u = 14 m/s

Unknown is distance = s = ?

Use equation: s = ut + \frac{1}{2} at²

Substitute all the known values inside the equation:

s = (14*5) + 0.5 * 3.5 * 5²

s = 70 + 43.75 = 113.75 m

The car travels 113.75 metres.

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Can anybody help me solve this problem? Thank you so much!
ser-zykov [4K]
Please ignore my comment -- mass is not needed, here is how to solve it. pls do the math

at bottom box has only kinetic energy
ke = (1/2)mv^2
v = initial velocity
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s = distance travel = h/sin(a)
h = height at top
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u = (1/2)v^2 x tan (a) / gh
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2 years ago
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