Powdered sugar contains corn starch
Acceleration=change in velocity divided by change in time or
we are given that it goes from 5m/s to 15m/s
in this case,
and the change in time or
is 1 second because this change occurs over a period of 1 second
so the acceleration is
the acceleration is
1)
The average acceleration of the sprinter can be found by using the following SUVAT equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
d is the distance covered
In this problem,
u = 0 (the sprinter starts from rest)
v = 11.9 m/s
d = 20.0 m
Solving for a, we find the acceleration:
2) 3.36 s
We can find the time needed to reach this speed by using the SUVAT equation:
where
v is the final velocity
u is the initial velocity
a is the acceleration
t is the time
Here we have
u = 0
v = 11.9 m/s
a = 3.54 m/s^2
Solving for t, we find the time: