Itried looking at formulas, if you know the formula can you list it?

a. -10 m/s²

b. -15000 N

Explanation:

a. First, write which variables are given:

v₀ = 20 m/s

v = 0 m/s

t = 2 s

Next, identify the variable you're looking for.

Find: a

Determine which equation uses these variables.  One trick is to find which variable isn't included in the problem, then find the equation that doesn't use that variable.  In this case, we don't need displacement Δx.  So the equation we should use is:

v = at + v₀

Plug in and solve:

(0 m/s) = a (2 s) + (20 m/s)

a = -10 m/s²

b. Force is mass times acceleration.

F = ma

F = (1500 kg) (-10 m/s²)

F = -15000 N

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