If it takes 10 seconds for a car to reach its top speed of 100 miles per hour, its acceleration would be. Help please

or

Explanation:

Acceleration is rate of change of speed per unit time. The change in speed is given by deducting the initial speed from final speed. Assuming that the car starts from rest to a top speed of 100 miles per hour, then the change in speed is equivalent to 100-0=100 miles per hour.

Time is given in seconds and converting to hours will be 10/3600

The acceleration will then be

Alternatively, the change in speed xould be converted to miles per second hence 100/3600 miles per second divided by 10 s then rounded off as

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27