devinkool
Answered

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Derek is riding his bike 10 mph. He takes 20 seconds to reach 15 mph. What is his acceleration?



0.25 mph/s


1.25 mph/s


4 mph/s


cannot be determined

Sagot :

austinde56

4 mph/s cause his change is 5mp in 20 seconds so do 20/5= 4 mph/s

                                                 

Answer: The correct answer is 0.25 mph/s.

Explanation:

The expression for the acceleration is as follows:

[tex]a= \frac{v-u}{t}[/tex]

Here, a is the acceleration, v is the final velocity and u is the initial velocity.

It is given in the problem that Derek is riding his bike 10 mph. He takes 20 seconds to reach 15 mph.

Calculate the acceleration.

Put t= 20 s, v= 15 mph and u= 10 mph in the above expression.

[tex]a= \frac{15-10}{20}[/tex]

[tex]a= 0.25 mph/s[/tex]

Therefore, his acceleration is 0.25 mph/s.

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