A runner achieves a velocity of 11.1m/s after it begins. What is its acceleration after 1 hour?

Question

2. A train is accelerating at a rate of 2.0m/s. If its inital velocity is 20 m/s, what is the final velocity after 30 second?

3. A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110m. Determine the acceleration of the car.

4. What is the final velocity of a bus that accelerates at a rate of 30m/2 to the 2nd power for a period of 2 min. if the initial v is 2 m/s?

Pls help I need to submit it today.

Answer 1

1) The runner is going nearly 25 miles per hour.  My guess is after 1 hour, his acceleration will be zero, because he will be exhausted.

2)  Surel you mean 2 m/s^2?  In that case, 2 * 30 + 20 m/s

3)  x = 1/2 a t^2   where t = 5.21, x= 110m.  so a = 8.1 m/s^2

4) 30 m/s^2 * 120 sec + 2 m/s = 3602 m/s, which is > 8000 mph.  Some bus!