Question

5.
A glass ball is dropped from height 10 m. If there is 20%
loss of energy due to impact, then after one impact, the
ball will go upto
(A) 2 m
(B) 4 m
(C) 6 m
(D) 8 m​

Answer 1

Answer:

ANSWER IS 8M

Explanation:

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Answer 2

★Solution :-

As per the given data ,

Initially ,

• Height of the ball from the ground = 10 m
• Acceleration due to gravity = 10 m/s²

Initial potential energy of the glass ball is given by ,

$\longrightarrow\mathtt{PE_i = mgh }$

$\longrightarrow\mathtt{PE_i = 10mg }$

• Energy loss due to impact = 20 %

• Energy left = 100 -20 = 80%

Potential energy of the ball remaining  after impact ,

$\longrightarrow\mathtt{PE_f = 10mg \times \dfrac{80}{100} }$

$\longrightarrow\mathtt{PE_f = 8 mg }$

$\longrightarrow\mathtt{mgh_f = 8 mg }$

$\longrightarrow\boxed{\mathtt{h_f = 8m }}$

The ball will go up to 8 m