for starting from rest and moving in a straight line,runner achieves a velocity of 7m/s in a time of 2 seconds .what is the average acceleration of the runer.
acceleration = velocity/time
= 7/2 = 3.5m/sec^2
To find the average acceleration of the runner, you need to divide the change in velocity by the time taken.
Given:
Initial velocity (u) = 0 m/s (starting from rest)
Final velocity (v) = 7 m/s
Time (t) = 2 seconds
The change in velocity (∆v) can be calculated as:
∆v = v - u
∆v = 7 m/s - 0 m/s
∆v = 7 m/s
Now, substitute the values in the formula for average acceleration (a):
a = ∆v / t
a = 7 m/s / 2 s
a = 3.5 m/s²
Therefore, the average acceleration of the runner is 3.5 m/s².