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honest raj

· started a discussion

· 1 Months ago

physics (Question:254558.0)

explain the qustion

Question:

A moving body of mass 20 kg has 40 joules of kinetic energy. Find  its speed.

Options:
A)

1 m/s

B)

1.5 m/s

C)

2 m/s

D)

2.5 m/s

Solution:

Kinetic energy = \(\cfrac{1}{2}\) mv2

Given, mass m=20 kg

K.E=40 J

So, 40=\(\cfrac{1}{2}\)×20×v2

v2= 4

and v= 2m/sec

So, the velocity of body is 2 m/sec

Knowledge Expert

· commented

· 1 Months ago

Dear student,
A body is moving whose weight is 20 and has 40 joules of kinetic energy, You have to caculate the speed of that body.
Keep learning,
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