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:
1. Molecules
2 physical change I want to say
Answer:
a) ball K <K₀, b) the speed of the ball after the collision, c) can K> 0
d) can moves in the same direction as the ball
Explanation:
a) the kinetic energy is given by
K = ½ M v²
in this case before the collision the kinetic energy of the ball is
K₀ = ½ M v₀²
After the collision the aluminum can has a certain speed, therefore the kinetic energy of the ball must decrease, the velocity of the ball after the collision is
v <v₀
therefore the kinetic energy is
K = ½ m v²
in consecuense
K <K₀
b) an evidence of this fact is to measure the speed of the ball before the collision and the speed of the ball after the collision,
c) In the case of the aluminum can, the initial kinetic energy is ero, because it is stopped
K₀ = 0
after the collision a part of the cal momentum of the ball is transferred to the can, therefore its velocity is different from zero
K = ½ m v_can²
K> 0
d) the clearest evidence of this fact is that the can moves in the same direction as the ball
Answer:
A. it's got everything set.... correct connection
Density = Mass/Volume
you multiply both sides of t<span>he equation by the volume and get:
Mass = Volume x Density
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