Question

(1) A 25 kg ball is thrown upward with a speed of 4 cm/s.
(a) Find its potential energy when it reaches the highest point.
(b) Calculate the maximum height it reaches.
ii) Calculate the pressure exerted by a book of size 10cm x 20 cm if the mass of the book is 200 g in SI unit.​

Answer 1

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Answer 2

Given:

A 25 kg ball is thrown upward with a speed of 4 cm/s.

Assume $g=9.8 ms^{-2}$

Find:

(a) Find its potential energy when it reaches the highest point.

(b) Calculate the maximum height it reaches.

ii) Calculate the pressure exerted by a book of size 10cm x 20 cm if the mass of the book is 200 g in SI unit.​

Solution:

Using 3  rd  Equation of motion

$v^{2} =u^{2} -2gh$

$0=4^{2} -2*9.8*h$

$h=0.816$

Potential Energy at highest point = mgh

$=25*9.8*0.816$

$=199.92$