Question

the kinetic energy of an object of mass M moving with a velocity of 5 M per second is 25 Jule what will be its kinetic energy when its velocity is doubled what will be its kinetic energy when its velocity is increased their times​

Answer 1

the K.E(KINETIC ENERGY) of the object is 25 J.

So,

25=1/2*m*(5)2

Therefore,m=2 kg.

Now, when the velocity is doubled, velocity becomes=2*5=10 m/s(ms-1)

So,

K.E.=1/2*2*(10)2 =100 J.

Now,when the velocity is increased three times,the velocity will be=3*5=15m/s

Therefore,K.E.=1/2*2*(15)2 = 225 J

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Answer 2

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student-name Tanmay Sharma asked in Science

The kinetic energy of an object of mass , m moving with a velocity of 5m/s is 25J.what will be its kinetic energy when its velocity is doubled ?what will be its kinetic energy when its velocity is incrased three times

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student-name Shivangi Agnihotri answered this

197 helpful votes in Science, Class X

First, we will calculate the mass 'm ' of the object.

Now, Kinetic energy = 1 / 2 mv 2

So, 25 = 1 / 2 x m x (5) 2

25 = 1 / 2 x m x 25

m = 2kg

When the velocity of the object is doubled, it becomes 5 x 2 = 10 m s -1

Now, Kinetic energy = 1 / 2 mv 2

= 1 / 2 x m x (10) 2

= 1 / 2 x 2 x 100

= 100 J

Thus, when the velocity of the object is doubled, then it 's Kinetic energy becomes 100 J.

When the velocity of the object is increased three times, it becomes 5 x 3 = 15m s -1

Now, Kinetic energy = 1 / 2 mv 2

= 1 / 2 x m x (15) 2

= 1 / 2 x 2 x 225

= 225 J

Thus, when the velocity of the object is increased three times,then it 's Kinetic energy becomes 225 J.

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