QUES 1.A ball is dropped from a height of 10 m and find the velocity withwhich it will strike the ground and how much time it will taken toreach the ground. Also find out the time experimentally and comparethe time obtained in the two cases & then Comment.(Take g = 9.8 m/s)
Answers
Answer:
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Explanation:
When the ball is dropped from a 10m height, it loses 40% energy thus affecting the same percentage of height when it bounces back. Now 40% of the energy lost means 40% of the height also lost on bouncing back. Given height is 10m and when you lose 40% of 10m, left will be 60% of 10m.25-Mar-2017
Answer: v = 10 m/s
Explanation: Height = 10 m.
Acceleration due to gravity = 9.8 m/s².
Using the Formula ,Potential Energy = m.g.h
= 10 × 9.8 × 10 = 980 J.
(b). Now, By the law of the conservation of the Energy, Total amount of the energy of the system remains constant.
∴ Kinetic Energy before the body reaches the ground is equal to the Potential Energy at the height of 10 m.
∴ Kinetic Energy = 980 J.
(c). Kinetic Energy = 980 J.
Mass of the ball = 10 kg.
∵ K.E. = 1/2 × mv²
∴ 980 = 1/2 × 10 × v²
∴ v² = 980/5
⇒ v² = 196
∴ v = 14 m/s.