Question

I am unsure of how to get the answer for this question. Please help!

Answer 1

c) 5.4

Explanation:

Given:

u = 54 km/h

v = 32 km/h

d = 65 m = 0.065 km

We can calculate the time starting from the following equation:

`d=\mleft((u+v)/(2)\mright)\cdot\: t`

We solve for t:

`t=(d)/(\mleft((u+v)/(2)\mright))`

We substitute and calculate the time in hours, then convert that time to seconds, just like this:

`\begin{gathered} t=(0.065)/((54+32)/(2))=0.00151\text{ h} \\ t=0.00151\text{ h}\cdot\frac{3600\text{ sec}}{1\text{ h}} \\ t=5.4\text{ sec} \end{gathered}`

Therefore, the time it would take is 5.4 seconds