These quaction has the answerd but I need an expalntion that how we get the answ

Question

These quaction has the answerd but I need an expalntion that how we get the answer

Multiple Choice, 2 points each. Print the letter of the best answer in the space provided. You can receive partial credit by putting two letters in the space. If one of the letters is correct, you will receive half credit. No credit if you write more than two letters in the space. 3. S The total momentum of a system is conserved Always If the system is isolated. If the forces on the system are conservative. D. In an elastic collision but not in an inelastic collision E. n an inelastic collision but not in an elastic collision 4. A mass hanging from a spring attached to the ceiling is pulled down and released such that it oscillates back and forth. Neglect friction and air resistance. At what point does the mass have maximum velocity? At the equilibrium position Its velocity is constant C. At maximum downward displacement D. At maximum upward displacement 5. A crane lowers a column of concrete into place at constant speed. Consider the work W, done by and the work Wr done by the tension in the cable. Which is true? A. W. 0 and Wr >0 B. W

Explanation / Answer

3.

A system may contain any number of objects but in collision

the energy is transfered between only these objects

for the momentum to be conserved

the system is isolated

4.

the equilibrium position is taken as origin so while oscillating the

potential energy is zero so kinetic energy is maximum

the velocity is maximum at equilibrium position

5.

while lowering the gravitational force and displacement is positive

but the tension and displacement are in opposite direction

6.

the perfect elastic collision is only between atoms

the collision between any objects is never perfectly ellastic

so it is slightly less than 3 m/s

7.

In an inelastic collision the loss of energy takes place in the form of sound energy

or heat energy

8.

From work energy theorem the total work = change in KE

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