Question

The kinetic energy of an object is 400 joule. If the mass of the object is 2kg then what will be the velocity of the object?​

Answer 1

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The kinetic energy of an object is 400 joule. If the mass of the object is 2kg then what will be the velocity of the object?

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KE = 1/2 mv²

=> 400 = 1/2 × 2 × v²

=> 400 = v²

=> √400 = v

=> v = 20 m/s

Answer 2

Answer:

Given:

Kinetic energy=K.E=400J

time=t=2sec

u=0m/s

mass=m=?

Let us find out Velocity at the end of 2sec:

From first equation of motion:

V=u+gt

V=0+10x 2 [∵g=10m/s²]

=20 m/s

K.E=mV²/2

m=2XK.E/V²

⇒2x400/20x20

⇒2kg

∴ Mass of the object is 2kg