Question

What was the initial speed of a truck that ended up with a speed of 65 Km/hr after it accelerated 3 Km/hr/sec for a period of 5 seconds?

Answer 1

50 km/hr

Explanation:

Given:

Final speed (v) = 65 km/hr

Acceleration (a) = 3 km/hr/sec

Time (t) = 5 sec

We have the following formula, we substitute and solve for the initial speed, just like this:

`\begin{gathered} v=u+at \\ \\ 65=u+3\cdot5 \\ \\ u=65-15 \\ \\ u=50\text{ km/hr} \end{gathered}`

Therefore, the initial speed is 50 km/hr.