Please answer above questions. it's urgent
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Explanation:
3)
potential energy stored in string is converted into kinetic energy.
4)
max height=u^2/2g
=20×20/20
Hmax=20m
p. E=mgh
20×20×10
=4000j
in question units of velocity are given wrong
5)
energy neither be created nor destroyed but it can be transformed into other forms.
6)
power =work done/time
energy is how much work done.
units of power=watt
units of energy=just,cal
power depends on time
energy is independent of time
7)
work done =change in kinetic energy
initially the ball is at rest
K. E1=0
K. E2=P^2/2M
=5×5/2×0.5
K. E2=25 kg m^2s^2
w=K.E2-K.E1
W=25J
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