Grade 9Mechanics

A ball is dropped on the floor from a height of 20m. It rebounds to a height of 1om. If the ball is in contact with floor for 0.1s. what is average acceleration during contact

Deepak kumar

7 Years agoGrade 9

2 Answers

jim larrington

7 Years ago

Use v^2=u^2+2as formula to find the velocity of the ball when it interacts with the floor. the answer is 26.3 metres per second.

Ashok Mishra

7 Years ago

u of the ball when it strikes the ground

=√2gh

=√2×10×20=20 m/s

v of the ball when it bounces and reaches a max. height 10 m

=√2gh

=√2×10×10=10√2 m/s

avg acc^n = u-v/t

10√2-20/0.1 = -5.85 × 10^-3

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A ball is dropped on the floor from a height of 20m. It rebounds to a height of 1om. If the ball is in contact with floor for 0.1s. what is average acceleration during contact

Deepak kumar

2 Answers

jim larrington

Ashok Mishra

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