17.86m/s
Explanation:
Given parameters:
Displacement of the ball = 50m
Time taken = 2.8s
Unknown:
Velocity of the ball = ?
Solution:
velocity is the rate of change of displacement with time
Velocity =
Velocity = = 17.86m/s
Learn more:
velocity brainly.com/question/5248528
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By Newton's second law,
<em>n</em> + (-<em>w</em>) = 0
<em>p</em> + (-<em>f</em> ) = (20 kg) (2 m/s²)
where <em>n</em> is the magnitude of the normal force, <em>w</em> is the weight of the box, <em>p</em> is the magnitude of the applied force (<em>p</em> for <u>p</u>ush or <u>p</u>ull), and <em>f</em> is the magnitude of the friction force.
Calculate the weight of the box:
<em>w</em> = (20 kg) (9.80 m/s²) = 196 N
Then
<em>n</em> = <em>w</em> = 196 N
and
<em>f</em> = <em>µ</em> <em>n</em> = 0.5 (196 N) = 98 N
Now solve for <em>p</em> :
<em>p</em> - 98 N = 40 N
<em>p</em> = 138 N
Answer:
4
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3
Explanation:
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50. The atomic mass is essentially a tally of all of the atoms in the nucleus, since electrons are essentially negligible in mass.
Answer:
false
Explanation:
they study different things, they all have there own specialty
hope this helps :)