Question

Please answer above questions. it's urgent​

Answer 1

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