3. Use the concept of conservation of energy to determine the maximum height obt

Question

3. Use the concept of conservation of energy to determine the maximum height obtained by a ball thrown vertically upward with a speed of 15 m/s. 4. A flower pot falls from rest to the ground below. If the mass of the pot is m and its initial height is h, which statement below is correct? A. The KE of the pot when it hits the ground does not depend on m. B. The KE of the pot when it hits the ground is linearly proportional to h. C. The speed of the pot when it hits the ground depends on m. D. The speed of the pot when it hits the ground is linearly proportional to h E. None of the above alternatives are correct.

Explanation / Answer

Answer is B.

A.Incorrect ,since Kinetic energy is given by

K=(1/2)mV2

B.Correct ,By Conservation of energy

KE=mgh

C.Incorrect

By Conservation of energy

(1/2)mV2=mgh

V=sqrt(2gh)

D.Incorrect

Speed of the pot is linearly proportional to square root of h

e.INcorrect

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