At a certain time a particle had a speed of 86 m/s in the positive x direction, and 5.2 s later its speed was 25 m/s in the opposite direction. What was the average acceleration of the particle during this 5.2 s interval?

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

the answer is a. hope this .

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