Question

How fast should a man weighing 60 kg so that his K.E is 750kg

Answer 1

Answer:ke=1/2mv2

750=1/2×60×v2

V2=25

V=5m/s

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Answer 2

Given:

Mass = 60 kg

Kinetic Energy = 750 J

To find:

Velocity of the man ?

Concept:

Kinetic Energy is a sub- type of mechanical energy present in a body by the virtue of its motion.

Work - Energy theorem states that the total work done by all the forces on a body is equal to the change in kinetic energy of that body in that particular reference frame.

Calculation:

$\sf{KE = \dfrac{1}{2} m {v}^{2} }$

$\sf{ = > 750 = \dfrac{1}{2} \times 60 \times {v}^{2} }$

$\sf{ = > 1500 = 60 \times {v}^{2} }$

$\sf{ = > {v}^{2} = \dfrac{1500}{60} }$

$\sf{ = > {v}^{2} = \dfrac{150}{6} }$

$\sf{ = > {v}^{2} = 25 }$

$\sf{ = > v= 5 \: m {s}^{ - 1} }$

So , final answer is :

$\boxed{ \huge{ \blue{ \sf{v= 5 \: m {s}^{ - 1} }}}}$