Question

1) As the object moves from point A to point D across the surface, the sum of

its gravitational potential and kinetic energies ____.

a. decreases
b. decreases and then increases

c. increases and then decreases
d. remains the same

2) The object will have a minimum gravitational potential energy at point ____.

a. A
b. B
c. C
d. D



3) The object's kinetic energy at point C is less than its kinetic energy at point

___.

a. A only
b. A, D, and E
c. B only
d. D and E​

Answer 1

Answer:

1)A AS GRAVITATION POTENTIAL AND KINETI DEPEND ON POSITION AND MOTION.

2)B, AS THE POSITION IS THE MOST BELOW

3)C

Answer 2

Answer:

(d)sum of P.E and K.E remains same

(b)The object will have a minimum gravitational potential energy at point B

(c)The object's kinetic energy at point C is less than its kinetic energy at point B only

Explanation:

(d)remains same

1)The Total Mechanical Energy i.e Sum of Kinetic Energy And Potential energy is always conserved hence as the object moves from point A to point D,the sum of its gravitational potential energy and kinetic energy remains same.

(b)point B

2)The gravitational potential energy is P.E=mgh

Therefore the object will have minimum energy at point where height is minimum.At point B,the height us minimum.Hence,object will have minimum potential energy at point B

(c)B only

3)The kinetic energy at C is less than the points where the potential energy at those points is less than that of C.Only point B has less potential energy than C,hence its kinetic energy is more than C.Therefore kinetic energy at point C is less than at point B

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