Question

hi can you please answer this question as soon as possible ​

Answer 1

Answer: 800 J

Explanation:

Given, height above the ground, h = 20 m

Mass of the ball, m = 4 kg

Speed of the ball while striking the ground, v = 20 ms-1

Acceleration due to gravity, g = 10 Nkg-1

According to law of conservation of energy, all energy of the ball will be converted into sound heat energy because the ball does not rebound.

∴ Energy of the ball = 1/2 mv²

                                 = 1/2 (4)(20)²

                                 = 800 J

 

Hence, 800 J of energy will be converted into heat and sound.

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