Question

An object of mass 500kg is travelling with a velocity of 72Km/hr. calculate the work done to bring it to rest​

Answer 1

Answer:

10,000J

Explanation:

$velocity = v = 72km/h = 72 \times \frac{5}{18} m/sec = 20 m/sec$

mass of the object = 500kg

work done to bring it to rest = change in its K.E. = $\frac{1}{2} mv^2$

$\implies$ $\frac{1}{2} \times 500 \times 20^2 = 10000J$