A car travels on a straight, level road......

Question

A.) Starting from rest, the car is going 46 ft/s (31 mi/h) at the end of 4.5 s. What is the car's average acceleration in ft/s^{2 ?}

magnitude ___ ft

 

B.)  In 3.5 more seconds, the car is going 92 ft/s (63 mi/h). What is the car's average acceleration for this time period?

magnitude ___ ft

 

C.) The car then slows to 69 ft/s (47 mi/h) in 2.5 s. What is the average acceleration for this time period?

magnitude ___ ft

 

D.) What is the overall average acceleration for the total time?

magnitude ___ ft

Answer 1

average acceleration = (final velocity - initial velocity) / time taken

A) (46-0)/4.5=1.0

B) (92-46)/3.5=13

C) (69-92)/2.5=-9.2

D) (69-0)/(4.5+3.5+2.5)=6.6