Arace car is moving with a velocity of 144 km/h the driver applies the brakes and the car comes to a halt in 12 seconds what is the average acceleration of the car during those 12 seconds

Average acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) - (speed at the beginning)

Change in speed = (zero) - (144 km/hr)

Change in speed = -144 km/hr

(-144 km/hr) x (1,000 m/km) x (1 hour/3600 sec) = -40 m/s

Time for the change = 12 seconds

Average acceleration = (-40 m/s) / (12 s)

Average acceleration = -3.33 m/s² (about 1/3 of a 'G')

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

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