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# M1 Question watch

1. The question is a sprinter starts from rest and accelerates at 2ms for the first 4 secs of the race. Sprinter moves along a straight line.

A. Find the distance over the 4 seconds

I got this as 16m which is right

B. Find the speed after the end of the 1st 4 seconds
I got this as 8ms which is also right

C. The sprinter then travels at this speed for the remainer of the race, he travels a total distance of 100m, Find the total time he takes to complete the race

I'm not really sure about how to find this?
2. (Original post by SunDun111)
The question is a sprinter starts from rest and accelerates at 2ms for the first 4 secs of the race. Sprinter moves along a straight line.

A. Find the distance over the 4 seconds

I got this as 16m which is right

B. Find the speed after the end of the 1st 4 seconds
I got this as 8ms which is also right

C. The sprinter then travels at this speed for the remainer of the race, he travels a total distance of 100m, Find the total time he takes to complete the race

I'm not really sure about how to find this?
So, he's already travelled 16 metres. Hence he only has 100-16 = 84 metres left to cover. He does this at 8 metres per second.

So, what's the time he takes to cover the remaining 84 metres at 8 m/s? Add this to the fours seconds and you get the total time.
3. (Original post by Zacken)
So, he's already travelled 16 metres. Hence he only has 100-16 = 84 metres left to cover. He does this at 8 metres per second.

So, what's the time he takes to cover the remaining 84 metres at 8 m/s? Add this to the fours seconds and you get the total time.
thanks
4. (Original post by SunDun111)
thanks
No problem.

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