Question

Correct formula for work done when an object change its velocity from u to v is

(a) 1/2 m (v-u)

(b) 1/2 m (v²-u²)

(c) 1/2 mv²

(d) 1/2(mv²-mu²)
²​

Answer 1

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b 1/2 m (v²-u²)

Answer 2

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Q 1. Correct formula for work done when an object change its velocity from u to v is ?

• $\frac{1}{2 \: } m(v - u)$

• $\frac{1}{2} \: m \: ( {v}^{2} - {u}^{2} )$ ✔️

• $\frac{1}{2} m {v}^{2}$

• $\frac{1}{2} (m {v}^{2} - m {u}^{2})$

→ Know more :-

Work :- work done of an object is defined as the magnitude of force multiplied by distance moved by object in the direction of applied force . The unit of work is called Joule

1 Joule = 1 Newton × 1 metre

• work done on an object by a force would be zero if the displacement of object is zero.

Energy :- an object having capability to do work is said to possess energy. Energy has a same unit as that of work .

• the energy possessed by a body due to its change in position or shape is called potential energy .

• energy exist in nature in several form such as kinetic energy , potential energy, heat energy, chemical energy etc.

Power :- power is defined as rate of doing work. The SI unit of power is watt .

1 W = 1 J/s

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