Physics

Grade-7

Easy

Question

Direction : Calculate the missing term.
m = 10 kg
K.E. = 250 J
v = ?

2500 m/s
$\sqrt{50}$
50 m/s
10 m/s

hint Hint:

√50

The correct answer is: $square root of 50$

$KE space equals space 1 half mv squared straight v squared space equals space fraction numerator 2 KE over denominator straight m end fraction equals space fraction numerator 2 space cross times space 250 over denominator 10 end fraction$
= 50
$Error converting from MathML to accessible text.$

What is the new kinetic energy of a body of mass m, moving at a velocity, v, when its velocity becomes 5 v

PhysicsGrade-7

Grade-7

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What is the new kinetic energy of a body of mass m, moving at a velocity, v, when its velocity becomes v/3

PhysicsGrade-7

Grade-7

Physics

What is the new kinetic energy of a body of mass m, moving at a velocity, v, when its velocity becomes 3 v

PhysicsGrade-7

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Direction : Calculate the missing term.m = 10 kgK.E. = 250 Jv = ?

2500 m/s50 m/s10 m/s

√50

The correct answer is:

= 50

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Direction : Calculate the missing term.
m = 10 kg
K.E. = 250 J
v = ?

2500 m/s
$\sqrt{50}$
50 m/s
10 m/s

The correct answer is: $square root of 50$

$KE space equals space 1 half mv squared straight v squared space equals space fraction numerator 2 KE over denominator straight m end fraction equals space fraction numerator 2 space cross times space 250 over denominator 10 end fraction$
= 50
$Error converting from MathML to accessible text.$

What is wrong with the given formula?
$KE space equals space 2 mv squared$

What is wrong with the given formula?
$KE space equals space 2 mv squared$

Direction : Is this an example of kinetic energy?
A person ready to dive

Direction : Is this an example of kinetic energy?
A person ready to dive

Direction : Is this an example of kinetic energy?
Flying airplane

Direction : Is this an example of kinetic energy?
Flying airplane

Direction : Is this an example of kinetic energy?
Throwing a ball

Direction : Is this an example of kinetic energy?
Throwing a ball

Direction : Is this an example of kinetic energy?
Stretched rubber band

Direction : Is this an example of kinetic energy?
Stretched rubber band

Direction : Is this an example of kinetic energy?
Motion of a meteor

Direction : Is this an example of kinetic energy?
Motion of a meteor