The force applies an acceleration in the reverse direction of
29 N = (0.145 kg) <em>a</em> → <em>a</em> = 200 m/s²
and in order to hit the ball back with speed 40.0 m/s, this acceleration is applied over time <em>t </em>such that
200 m/s² = (40.0 m/s - (-40.0 m/s)) / <em>t</em> → <em>t</em> = (80.0 m/s) / (200 m/s²) = 0.4 s
40 because it is the highest and also because
Answer:
force normal = mass times acceleration
F=ma
54= m (3.8)
divide by 3.8 in both sides
54/3.8
mass of the little brother is 14.2 kg
The self inductance can be calculated as 4.444 Henry.
The inductor will store energy = 20 joule,
current = 3 ampere.
<h3>What is Self inductance?</h3>
The current carrying conductor which allows or opposes the change of flow of current is known as self-inductance. The rate of change of current can also be given through self inductance.
Formula can be given for the energy in the inductor as,
E = 1 / 2 × L × I² joule.
where as, E - Energy
L - Inductance
I - Current flowing through the coil.
The equation can be rearranged as,
L = 2 E/ I²
= 2 × 20 / 3²
= 40 / 9
Hence, L = 4.4444 Henry
Learn more about energy in inductors,
brainly.com/question/28030901
#SPJ4
