A pendulum has 665 j of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o
2 answers:
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Answer:
1) The girl's acceleration at time 't' is, m/s²
2) The girl's acceleration at time 't₁' is, m/s²
3) The girl's acceleration at time 't₂' is, m/s²
Explanation:
Given data,
The initial walking speed of the girl, u = 0
The speed of the girl at the time 't' 3 s is, v₁ = 1.4 m/s
The time period the girl walked at the speed 1.4 m/s is, t₁ = 6 s
The girl slows down and comes to a stop during a period, t₂ = 10 s
1) The girl's acceleration at time 't'
m/s²
2) The girl's acceleration at time 't₁'
m/s²
3) The girl's acceleration at time 't₂'
m/s²
Answer:
x = 400 [m]
Explanation:
To solve this problem we must use the following kinematics equations, first, we find the final speed, and then we proceed to find the distance traveled.
where:
Vf = final velocity [m/s]
Vi = initial velocity = 15 [m/s]
a = acceleration = 5 [m/s^2]
t = time = 10 [s]
Note: the positive sign in the Equation indicates that the car is accelerating, i.e. its speed is increasing.
<u>Now replacing</u>
Vf = 15 + (5*10)
Vf = 65 [m/s]
Now using the second equation:
where:
x = distance traveled [m]
x = (65^2 - 15^2)/ (2*5)
x = 400 [m]