Complete Question
The complete question is shown on the first uploaded image
Answer:
The value is
Explanation:
From the question we are told that
The mass of the block is
The initial speed of the block before entering the rough section is
The time taken is t = 0.5 s
The speed with which the block leaves the rough section is
Generally from kinematic equation
=>
=>
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Generally the magnitude of the average frictional force is mathematically represented as
=>
=>
The negative sign show that the force is acting in the opposite direction to the direction of motion of the block
Are you questioning when does evalution start..?
Answer:
it will travel 69 m long consuming. it is totally wrong
You would know it must have a charge, an Ion is a positively charged or negatively charged atom, so if it's an ion you know it has to have a charge.