The force a spring exerts on a body is a conservatice force because a. a spring

Question

The force a spring exerts on a body is a conservatice force because a. a spring always exerts a force oppsite to the displacement of the body b. a spring always exerts a force parallel to the displacement of the body c. the work a spring does on a body is equal for compression and extensions of equal magnitude d. the work a spring does on a body is equal and opposite for compression's and extensions of magnitude e. the net work a spring does on a body is zero when the body returns to its initial position 12. When two bodies of different masses collide, the impulses they exert on each other are a. equal for all collisions b. equal but opposite for all collisions c. equal but opposite only for elastic collisions d. equal but opposite only for inelastic collisions e. equal but opposite only when the bodies have equal but opposite accelerations

Explanation / Answer

12)
Impulse Change in Momentum,
The impulse exerted on each other is " Equal & opposite for all collisions"

13)
m = 4 kg
vi = - 5.0 m/s
vf = 3.0 m/s

Impulse, = Change in Momentum
Impulse, = m*(vf - vi)
Impulse, = 4*(3.0 + 5.0)
Impulse, = 32 Ns

Correct option - (b)

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