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In compressing the spring in a toy dart gun, 0.2 J of work is done. When the gun is fired, the spring gives its potential energy to a dart with a mass of 0.05 kg.
(a) What is the dart's kinetic energy as it leaves the gun?
0.2j



(b) What is the dart's speed?



Pleas help with part b I have tried everything I need help!!!

Respuesta :

pstnonsonjoku

a) The kinetic energy of the spring is 0.2 J

b) Speed of the dart  is 2.8 m/s

What is the work done?

Let us recall that work is said to be done when the force that is applied moves a distance in the direction of the force. Now we know that if we compress a spring, then the spring would have a potential energy called the elastic potential energy.

Let us now answer the questions;

a) Given the fact that energy is neither created nor destroyed but is converted from one form to the other, the kinetic energy of the dart is  0.2 J. This is from the law of the conservation of energy as we all know it.

b) Recall that;

KE = 1/2mv^2

KE = kinetic energy

m = mass of the object

v = speed of the object

v = √2KE/m

v =  √2 * 0.2/0.05

v = 2.8 m/s

Learn more about work done:https://brainly.com/question/13662169

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