Question

calculate the work required to be done to stop a car of mass 2000,kg moving at a velocity of 100 km/hr.

Answer 1

Answer :

• Given :

▶Mass = 2000 kg

▶Velocity = 100 km/hr = $\sf 100 \times \dfrac{5}{18}\:=\: \dfrac{500}{18}\:=\: 27.77$

• To Find :

▶ Work Done

• Sølution :

☯ Formula to be used =:

$\bold{\boxed{\boxed{\sf{\red{Work\:done\:=\:K.E.\:=\: \dfrac{1}{2}m{v}^{2}}}}}}$

• K.E. = $\sf \dfrac{1}{2} \times 2000 \times {27.77}^{2}$

• K.E. = $\sf 1000 \times 771.1729$

• K.E. = $\sf 771172\:J$

$\large\bold{\underline{\mathtt{\orange{Work\:Done\:=\:771\:KJ\:(approx)}}}}$

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