A bullet penetrates an object and its velocity is reduced by a half. What is the ratio between the initial kinetic energy of the bullet and kinetic energy when it leaves the object? KE, 1 O KE 2 KE; =2 KEF KE, = 1 O KE KE,1 • KE 4 %3! KE, = 4 KE
A bullet penetrates an object and its velocity is reduced by a half. What is the ratio between the initial kinetic energy of the bullet and kinetic energy when it leaves the object? KE, 1 O KE 2 KE; =2 KEF KE, = 1 O KE KE,1 • KE 4 %3! KE, = 4 KE
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Transcribed Image Text:A bullet penetrates an object and its velocity is reduced by a half.
What is the ratio between the initial kinetic energy of the bullet and
kinetic energy when it leaves the object?
KE, 1
O KE 2
KE;
KE
KE,
= 1
O KEF
KE, 1
• KE 4
%3!
KE,
= 4
KE
a. you hold your bag as you walked along level ground:
Yes v
b. a briefcase is carried up stairs at constant speed: Yes
C. a weightlifter lifts a 20Kg weight through a height of 1.2m:
Yes
d. a spring is stretched by Scm: Yes v
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