Question

if the rate of continental drift were to abruptly slow down from 1.0 cm/y to 0.5 cm/y over the time interval of a year, what would be the average acceleration​

Answer 1

Hope this helps! explanation also included :)

Answer 2

If the rate of continental drift were to abruptly slow down in the given time time interval, the average acceleration will be -0.5cm/y² ​

Given the data in the question;

• Initial velocity; $u = 1.0cm/y$

• Final velocity; $v = 0.5cm/y$

• Time; $t = 1y$

Average acceleration; $a= ?$

To determine the average acceleration, we use the First Equation of Motion: ​​

$v = u + at$

Where, v is the final velocity, u is the initial velocity, t is the time and a is the acceleration.

We make "a" the subject of the formula

$a = \frac{v-u}{t}$

We substitute our given values into the equation

$a = \frac{0.5cm/y\ -\ 1.0cm/y}{1y} \\\\a = \frac{-0.5cm/y}{1y}\\\\a = -0.5cm/y^2$

[the negative sign represent retar. or negative acceleration]

Therefore, if the rate of continental drift were to abruptly slow down in the given time time interval, the average acceleration will be -0.5cm/y² ​

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