Gravitational potential energy = mass x gravitational field strength (g) x height
Answer:
356 N
Explanation:
Newton's second law of motion describes the relationship between an object's mass and the amount of force needed to accelerate it.
here there is a weight acting downwards on the object , yet it is accelerating upwards shows that there is a net force upwards
Applying Newtons second law of motion upwards ,
Force = mass *acceleration
Upward force - m*g = m *a
F_up= 20 *8 + 20 * 9.8
= 356 N
Upward force= 160 N
Answer:
net voltage will become half that of initial voltage now
Explanation:
Initially two capacitors are connected across a given voltage difference
So the net charge on the two capacitors is given as


now when these are connected in parallel with no change in charge
then total charge on each plate is given


also we know that

now we will have


so net voltage will become half that of initial voltage now
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Work=force X distance
Newtons is a measurement of force
4 meters is your distance 60×4=240
240 joules