Question

What constant acceleration is required to increase the speed of a car from 28 mi/h to 53 mi/h in 5 s? (Round your answer to two decimal places.)

Answer 1

use the formula
\[\huge V_2 = V_1 + at\]
where V2 is the final speed
v1 is the initial speed
a is acceleration
t is time

so plug in!
\[\huge 53 = 28 + a(5)\]
\[\huge 53 - 28 = 5a\]
\[\huge 35 = 5a\]
\[\huge a = 7 \;m/s^2\]

Answer 2

Or \[a=\frac{V_f-V_i}{\Delta t}=\frac{53mi/h-28m/h}{5s}=?\]

Answer 3

ok thanks

Answer 4

i made a slight mistake
\[\huge 53 - 28 = 5a\]
\[\huge 25 = 5a\]
\[\huge a = 5 \; \; m/s^2\]