Posted by **Phil** on Thursday, September 16, 2010 at 1:25am.

A sprinter starts from rest in a 100-meter race, accelerates to his full running speed of 10.3 m/s in 1.15 seconds (assume constant acceleration) and continues at that speed for the rest of the race.

(a) How far did he run before attaining his full speed?

(b) What was his final time for the race?

- Physics -
**TutorCat**, Thursday, September 16, 2010 at 1:31am
(a)

acceleration=(final velocity-initial velocity)/time

distance = (1/2)*(acceleration)*(time)^2 + (initial velocity)*(time)

(b) 100m - _____ (<-answer from (a))

find time using this formula:

distance = (1/2)*(acceleration)*(time)^2 + (initial velocity)*(time)

finally, add that time with 1.15 seconds

- Physics -
**TutorCat**, Thursday, September 16, 2010 at 1:32am
note: for part (b) plug in the "new" distance

## Answer this Question

## Related Questions

- Physics - A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest...
- Physics - A sprinter starts from rest and reaches his top speed in 4 seconds ...
- Physics - A tortoise and hare start from rest and have a race. As the race ...
- physics - A tortoise and hare start from rest and have a race. As the race ...
- Acceleration physics - 1. A sprinter finishes the race with a velocity of 8.9 m/...
- physics - A sprinter mass 72 kg runs the 50 meter dash in 8.35 s. Assume that ...
- science - A simple model for a person running a 100m race is to assume the ...
- physics - An antique carousel that’s powered by a large electric motor undergoes...
- Physics (College) - One simple model for a person running the 100 m dash is to ...
- physics - in a 100m race, 2 sprinters finish at the same time of 10.2 seconds, ...

More Related Questions