Physics, 29.06.2019 14:00 AutismRobotrix1999

An apple dropped from an apple tree. the height of the tree was 2.5 m. what was the final speed of the apple right before landing? the correct answer is 7 m/s. i have no clue pls

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Answer from: alliwkatring

The correct answer to the question is : 7 m/s.

EXPLANATION:

As per the question, the apple is at a height h = 2.5 m.

The initial velocity of the apple u = 0

We are asked to calculate the final velocity [ v ] of the apple before touching the ground.

As the apple is falling under gravity, then the acceleration produced on the apple is nothing else than acceleration due to gravity.

Hence, acceleration a = g = $9.8\ m/s^2$

From equation of kinematics , we know that -

$v^2-u^2\ =\ 2as$

⇒ $v^2=\ u^2+2gh$

⇒ $v^2=\ 0^2+2\times 9.8\times 2.5$

⇒ $v^2=\ 49$

⇒ $v=\ \sqrt{49}\ m/s$

⇒ $v=\ 7\ m/s$ [ans]

Hence, the final velocity is 7 m/s.

Answer from: Quest

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

Answer from: Quest

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

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An apple dropped from an apple tree. the height of the tree was 2.5 m. what was the final speed of t...