Mechanical energy is conserved in the presence of which of the following types of forces? select all that apply. a- electrostatic b- frictional c- magnetic d- gravitational

Mechanical energy remains constant (conserved) if only conservative forces act on the particles.

In this sense, the following forces are conservative:

-Gravitational

-Elastic

-Electrostatics

While the Friction Force and the Magnetic Force are not.

According to this, mechanical energy is conserved in the presence of electrostatic and gravitational forces. Therefore the correct options are A and D.

A- electrostatic

C- magnetic

D- gravitational

Explanation:

As per mechanical energy conservation law we can say that when all conservative forces are present on the system then mechanical energy is always conserved

So here we have to choose all such options which will give conservative forces only

so correct answers are

A- electrostatic

C- magnetic

D- gravitational

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

f is prop to m1xm2 double m1 double force