Answer:what is the question exactly
Explanation:
A force can be considered a push or pull
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The initial velocity of the hoop is determined as 8.854 m/s.
<h3>Conservation of energy</h3>
The initial velocity of the hoop can be determined from the principle of conservation of energy.
Final potential energy = Initial kinetic energy
P.E = K.E
mgh = ¹/₂mv²
gh = ¹/₂v²
2gh = v²
√2gh = v
√(2 x 9.8 x 4) = v
8.854 m/s = v
Thus, the initial velocity of the hoop is determined as 8.854 m/s.
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Answer:

Explanation:
By conservation of the linear momentum:
m1*V1 = (m1+m2)*V2
Solving for V2:

The kinetic energies are:



Simplifying:

The ratio will be:


Answer:
The minimum coefficient of friction is 0.22
Explanation:
Suppose If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve.
We need to calculate the ideal speed to take a 85 m radius curve banked at 15°.
Given that,
Radius = 85 m
Angle = 15°
Speed = 20 km/h
We need to calculate the ideal speed
Using formula of speed


Put the value into the formula


We need to calculate the minimum coefficient of friction
Using formula for coefficient of friction

Put the value into the formula





Hence, The minimum coefficient of friction is 0.22