Beginner mechanics 2

Classical Mechanics Level 1

A ball falls freely from the top of a tower on a sandy soil . Its velocity when reaching the ground is 90 m/s . Given that the free fall acceleration is 10 m/s², and the sand resistance to the ball motion is 3000N

Find the ball mass if it sank into sand and stopped 1 second later

  • write the answer to the nearest tenth

NOTE : The air resistance is neglected

25.2 kg 33.3 kg 50.7 kg 45.5 kg

Abdulrhman Hassien by Abdulrhman Hassien , 30, Egypt

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1 solution

Vi = Vf + A t

0 = 90 + A 1

A = -90

M = F / A

M = -3000 / -90 = 33.3 kg

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