Question

A car moving at 20 m/s begins to accelerate at the rate of 0.2 m/s2. In how much time, will its speed become one and a half times?

Answer 1

The general formula for velocity, acceleration, and time is this:
\[\Delta v = a \Delta t\]
Where Δv is the change in velocity, final - initial
And Δt is the time interval of the change.

It can be rewritten as this:
\[w_{final} - v_{initial} = a \Delta t\]

Answer 2

Your initial velocity is 20 m/s.
Your final velocity is 1.5 times 20 m/s.

Plug the values in, solve for time.