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Find the period of time an object takes to travel along a straight line in the velocity-time graph.

If $v(t)=a+2t$ when $a=0$, find the period of time an object takes to travel along a straight line in the velocity-time graph.
First, I decided to draw the velocity-time graph to get the answer. The velocity-time graph is shown here. I just have to solve for t to find the value of t.
$$v(t)=a+2t$$ $$v(t)=0+2t$$ $$t= \dfrac{ -a}{2}$$
$$t= -\frac{0}{2}$$
$$t= \frac{0}{2}$$
This is the answer.
However, when I tried to solve it, I got $t=2/3$ as the answer.
It’s possible I didn’t understand the graph. Please help me with this.

A:

The graph is indeed helpful, but here is the answer. Your problem is that when $t=0$, then the velocity is $0$, but $v_0=a$. Therefore, the velocity has to be $a$ for all $t$, so $v(t)=a$ for all $t$. Then you have $t=-\frac{a}{2}$ and $v(-\frac{a}{2})=\frac{a}{2}$, so $t=\frac{a}{2}$, which is what you’re getting. There

Hi guys, I have been trying to crack the B2.2 test in the Cambridge qualifications but I’m having a lot of trouble. I have made a seed which I have tried several times. The number of possible answers is 1,043 and the test is 10 minutes long. I have no idea how to approach the test because of the questions I have been given are just too general and there are no answers to be found.
This is a test which focuses on spoken English through reading, listening and writing, which is very common in everyday life. These sections of the test consist of a text with three questions and a mark of 10 for each question.
For question 1 I have to choose a word or phrase which means what or how. I chose want but this test has no answers to be found in.
Question 1
I know there is an Oxford dictionary called the Oxford English (OED) and if you click on the Oxford English Dictionary online to search for word games you can find questions exactly like this one. It would be great if someone could point me towards a similar application for the Cambridge qualifications. I would prefer to have it in Word format because I prefer to write things out.
Thanks for your help

A:

You are probably looking at the old-style CEFR tests. These still ask for numbers or letter answers, and the test book you are using has probably the same. I suspect the new tests have pictures with captions, so the answers would be categorised by the picture.
I found a pretty good test that includes the CEFR pictures for the B2 section here:
It also includes a guide to the B2 section here:
There are a few sample test questions for the guide, so you can try practising some of the tests on there.

Q:

Issue with skipTo() method

I’ve been trying to use the skipTo() method in Youtube API but I am experiencing problems. This is my code:
var player;
var target;