Plzzz kindly help me in the problem

1.	Plzzz kindly help me in the problem
Answer» Given :- Mass of the body = 20 kg INITIAL velocity of the body = 5 m/s Final velocity of the body = 2 m/s To Find :- The work done by the force Solution :- APPLYING work enegy theorem , $\\ : \implies \sf \:W = \Delta KE \\ \\$ $\\ : \implies{\sf{\star \: {\boxed{\purple{\sf{W = \dfrac{1}{2}m {v}^{2} - \dfrac{1}{2} m {u}^{2} }}}}}} \\ \\$ Where , W is work done m is mass u is initial velocity v is final velocity We have , m = 20 kg v = 2 m/s u = 5 m/s Substituting the values :- $\\ : \implies \sf \: W = \dfrac{1}{2}(20) {(2)}^{2} - \dfrac{1}{2} (20) {(5)}^{2} \\ \\$ $\\ : \implies \sf \: W = \dfrac{1}{2} (20)(4) - \dfrac{1}{2} (20)(25) \\ \\$ $\\ : \implies \sf \: W = \dfrac{1}{2} (80) - \dfrac{1}{2} (500) \\ \\$ $\\ : \implies \sf \: W = 40 - 250 \\ \\$ $\\ :\implies{\underline{\boxed{\mathfrak{\pink{ W = - 210 \: J }}}}} \: \bigstar \\ \\$

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