How to solve this basic kinematics problem?
A sprinter runs the #100\ m# floors in #10.0\ s# . Approximate its motion assuming a constant acceleration in the first #15\ m# and then a constant speed for the remaining #85\ m# .
How to determinate:
1. its final speed
2. the time taken to cover the first #15\ m#
3. the time needed for the other #85\ m#
4. the magnitude of the acceleration for the first #15\ m#
A sprinter runs the
How to determinate:
1. its final speed
2. the time taken to cover the first
3. the time needed for the other
4. the magnitude of the acceleration for the first
1 Answer
Final speed
time 1:
time 2:
acceleration:
Explanation:
You have 4 unknown data (
from the second equation, and by combining the third with the fourth equations, we obtain the time for the 2 paths
that we put in the first equation
now we have the speed
... the time 1
... the time 2
...the acceleration