Question

At what speed a body of mass 1kg will have a kinetic energy of 1 j

Answer 1

K=1/2mv^2

By subsisting we get;                                                                                                                

1=1/2*1*V^2

1*2/1=V^2

2=V^2

.:. V=1.414

Answer 2

Given,

Mass of a body = 1 Kg

The kinetic energy of the body = 1 J

To find,

Speed of the body.

Solution,

We can simply solve this numerical problem by using the following process:

Let us assume that the speed of the body is x m/s.

Mathematically,

Kinetic energy (KE)= 1/2 × mass of the body × (speed)^2

=> speed = √{2 × (KE)/mass}

Now, according to the question;

Speed of the body

= √{2 × (KE)/(mass)}

= √{2 × (1 J)/1 Kg}

= √2 m/s

Hence, the speEd of the body is equal to √2 m/s.