a mass of 3g is moving with a velocity of 18km/h.calculate kinetic energy of the body in joule.

As we know that kinetic energy of the body is given by,

K.E. = (1/2)×m×v² 

m = 3 g = 3/1000 kg = 0.003 kg

v = 18 km /h = (18×1000)/(60×60) = 5 m/s

K.E. = (1/2)×0.003×5×5 = 0.0375 J