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