Question

a car accelerates from rest (zero speed) up to a speed of 30 m/s in 12 seconds. calculate the acceleration.

Answer 1

2.5 m/s^2

Step-by-step explanation:

There is this thing in Physics called the BIG 4 equations that help us determine one or more of the missing variables. In this case, we know the initial velocity, final velocity, and time. We're asked to find the acceleration.

This equation has all the criteria to find acceleration:

Vf = at + Vi ---> Final Velocity is equal to acceleration times time plus initial velocity

Plugging in the values and using algebra, we can find the acceleration.

30 = 12a + 0

a = 2.5

Answer 2

v=u+at

30=0+a×12

30=12a

a=
`(30)/(12)`

a=2.5ms⁻²