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katovenus [111]
2 years ago
11

A mango fruit drops to the ground from the top of its tree which is 5 m high. How long does it take to reach the ground?

Physics
2 answers:
dimaraw [331]2 years ago
7 0

Answer:

Explanation:

with zero initial velocity we can use the kinematic equation.

h = ½at²

t = √(2h/g)

t = √(2(5)/10)

t = √1

t = 1 s

So probably answer A although the precision is too high. The precision of the input numbers are only a single significant digit, whereas A has two.

erik [133]2 years ago
5 0

answer : the answer is 5 seconds

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Answer:

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Explanation:

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\dfrac{1}{2}m(v^2-u^2)=(mg\sin\theta-f)d\\\Rightarrow \dfrac{1}{2}mv^2=mg\sin\theta d-fd\\\Rightarrow fd=mg\sin\theta d-\dfrac{1}{2}mv^2\\\Rightarrow fd=20\times \sin 30^{\circ}\times 150-\dfrac{1}{2}\times \dfrac{20}{9.81}\times 15^2\\\Rightarrow fd=1270.64\ \text{J}

The work done against friction is 1270.64\ \text{J}.

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