Please provide correct answers with full explanations. from 2ms A 3 kg box slide

Question

Please provide correct answers with full explanations.

from 2ms A 3 kg box slides on a smooth ramp A to B and subsequently undergoes a projectile motion until it strikes the ground at C as shown. The speed of the box at A is vA 2 m/s. Which of the following statements is true? (2 Marks) datun (i) The work done by the conservative weight force from A to B is calculated from mg(h, ), where h is the height above the datum. Conservation of mechanical energy is valid for the entire motion of the box from A to B to C iii The work done by the normal force from A to B is calculated from N(h, -), where N is the normal force and h is the height above the datum at B From B to C, the box has a constant acceleration of -g in the y direction. (iv) Question 2 The 2 kg block slides in the smooth horizontal track. It is released from rest when the block is drawn back at s = 2 m at A. The spring stiffness k = 2500 N/m with an unstretched length of 0.5 m. Which of the following statements is true? (2 Marks) 2500N/m 0.6 m Conservation of energy is applicable for the motion of the block from A to B The work done, during motion from A to B, by the gravitational force and normal force exerted (i) (ii) n the block is zero (ii The change of the spring elastic energy from A to B is calculated fro-(5,-s where s is the spring's unstretched length. The change of spring elastic energy from A to B is calculated from sg are the spring lengths at A and B, respectively (s,-s.), where s, and

Explanation / Answer

According to Chegg guidelines, we are not supposed to answer multiple questions at a time. Please repost the other question as a separate question.

Question 1

1) TRUE

Since gravity is a conservative force, the work done by conservatives forces only depend upon initial and final positions, not the path taken/traveled

2) TRUE

There are gravity and normal force, gravity is conservative and Normal force doesn't do any work because Normal force is always perpendicular to displacement. Hence work done by the normal force is always 0.

Therefore when only conservative forces play a part in any motion, mechanical energy is conserved.

3) FALSE

As explained above, the Normal force being non-conservative in nature, it can't be calculated as shown.Moreover, it's 0

4) FALSE

g is acting throughout the path and is in negative y direction.

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