Question

) A toy race car zooms across the ground with an acceleration of 2.8 m/s^2. After 4 seconds it has a final velocity of 22.2 m/s, what is the toy car's initial velocity? show work

Answer 1

We can use the equation of motion to solve this problem:

v = u + at

where:
v = final velocity = 22.2 m/s
u = initial velocity (what we need to find)
a = acceleration = 2.8 m/s^2
t = time taken = 4 s

Rearranging the equation, we get:

u = v - at

Substituting the given values:

u = 22.2 m/s - 2.8 m/s^2 * 4 s

Simplifying the equation, we have:

u = 22.2 m/s - 11.2 m/s
u = 11 m/s

Therefore, the toy car's initial velocity is 11 m/s.