21. suppose the speed of a car changes from 16 m/s to 25 m/s in 20 seconds when its gas pedal is pressed…

21. suppose the speed of a car changes from 16 m/s to 25 m/s in 20 seconds when its gas pedal is pressed hard. the cars acceleration is (a) 9.8 m/s² (b) 32 m/s² (c) 0.5 m/s² (d) 6.7 m/s² (e) none of the above

21. suppose the speed of a car changes from 16 m/s to 25 m/s in 20 seconds when its gas pedal is pressed hard. the cars acceleration is (a) 9.8 m/s² (b) 32 m/s² (c) 0.5 m/s² (d) 6.7 m/s² (e) none of the above

Answer

Explanation:

Step1: Recall acceleration formula

The formula for acceleration $a=\frac{v - u}{t}$, where $v$ is final - velocity, $u$ is initial - velocity, and $t$ is time.

Step2: Identify values

Given $u = 16\ m/s$, $v = 25\ m/s$, and $t = 20\ s$.

Step3: Substitute values into formula

$a=\frac{25 - 16}{20}=\frac{9}{20}=0.45\ m/s^{2}$. Since $0.45\ m/s^{2}$ is not in the given options, the answer is none of the above.

Answer:

(e) none of the above