Tommy was walking at a rate of 4 miles hour at noon and at 12: 30 pm he was walking at a brisk rate of 6 miles hour . two hours later tommy was walking at a leisurely rate of 2 miles hour . which statement about tommy's accleration is true? a) tommy had an accleration of zero the entire time. b) tommy had a positive acceleration between noon and 12: 30 pm. c) tommy had a positive acceleration between 12: 30 and 2: 30 pm. d) tommy had a negative acceleration between noon and 12: 30 pm.

B)Tommy had a positive acceleration between noon and 12:30 pm.

Explanation:

Acceleration is defined as the rate of change of velocity:

where

v is the final velocity

u is the initial velocity

t is the time

In the problem,

- At noon, Tommy is walking at a velocity of 4 mi/h

- At 12.30 pm, Tommy is walking at a velocity of 6 mi/h

- A time of half an hour (0.5 h) passed between the two moments

So Tommy's acceleration is

and the acceleration is positive, since the velocity has increased.

the force on the thing and the distance the force moves the thing