Acar that increases its speed from 20km/h to 100km/h undergoes what acceleration

A car that increases its speed from 20 km/h to 100 km/h undergoes positive acceleration.

In fact, acceleration is defined as:

where v is the final velocity, u is the initial velocity, and t is the time taken. t has always positive sign, and in this case, the final velocity (v=100 km/h) is greater than the initial velocity (u=20 km/h), so the numerator is positive and therefore the acceleration is positive.

Explanation:

the answer is a)

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find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2