Answer:
c) is negative
Explanation:
As we know that work done by a force is the product of force and displacement vector.
W= F.d
F= Force
d= displacement
The work done by friction force always negative because it try to oppose the motion and act opposite to the direction of displacement.So the work done by air resistance is negative.
c) is negative
Answer:
The correct answer is:
doesn't change (d)
Explanation:
The total energy in a system is the sum of Kinetic and Potential energies in a system, assuming that energy is not lost to an external procedure. Now, let us define what potential and kinetic energies are:
Potential Energy: this is energy at rest or stored energy
Kinetic Energy: this is energy in motion
In a simple harmonic motion of a mass-spring system, there is no dissipative force, hence the total energy is equal to the potential and kinetic energies. The total energy is not changed rather, it varies between potential and kinetic energies depending on the point at which the mass is. The kinetic energy is greatest at the point of lowest amplitude (highest velocity) and lowest at the point of greatest amplitude (lowest velocity), while potential energy is greatest at the point of highest amplitude (lowest velocity) and lowest at the point of smallest amplitude ( highest velocity). However, at every point, the sum of kinetic and potential energies equals total energy.
It is answer a a fishing magazine
Answer:
jfonox
Explanation:
since impulse is the change in momentum given by
Impulse = Force x time = change in momentum
I = ft = mv-mu= m(v-u)= jfonox
since the object is initially at rest
u=0,
mv is the final momentum of the object
I =Ft = m(v - 0) = jfonox
mv= jfonox
this show that the final momentum of the object at rest is equal to the impulse received
if any of the mass m, final velocity v or the impact force and the duration of impact of the object is known then we can find or quantify the final momentum.
