Question

A MASS of 18kg is moving with the velocity of 60km/hr. What amount of work is to be done to bring the body to a standstill?​

Answer 1

Answer:

$\huge•\bigstar{\underline{{\red{A}{\pink{n}{\color{blue}{s}{\color{gold}{w}{\color{aqua}{e}{\color{lime}{r}}}}}}}}}\huge\bigstar•$

When a object is moving with a constant velocity, it possess K.E

K.E= 1/2×m×v²

So, in order to bring the object to rest i.e its same magnitude of energy is required so, as the final final energy comes to zero.

v=60km/hr=16.66m/s

So, magnitude of work that needs to be done = 1/2×m×v²

Hence, work required to stop the car =

1/2 ×1500×16.66²

=208166.7J=208.17kJ