The equivalent capacitance of this circuit is = 21F. That is option A.
<h3>Calculation of the equivalent capacitance</h3>
When capacitors are connected together in parallel the total or equivalent capacitance, CT in the circuit is equal to the sum of all the individual capacitors added together.
The four capacitors are 10 F, 3 F, 7 F, and 1 F.
Therefore the equivalent capacitance = 10 + 3 + 7 + 1=21F
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This is not copied and here is proof:
Answer:

Explanation:
From the question we are told that:
Height
Length
Mass 
Final speed
Generally the equation for Potential Energy P.E is mathematically given by

Therefore
Initial potential energy

Generally the equation for Kinetic Energy K.E is mathematically given by

Therefore
Final kinetic energy

Generally the equation for Work_done is mathematically given by

Therefore

