Question

find out the kinetic energy of a car of mass 3000 kg Moving with a constant velocity of 60 km/hr

Answer 1

Kinetic energy=
$(1 \div 2) \times m {v}^{2}$
Here,
mass,m=3000kg
velocity,v=60kmph=
$60 \times 5 \div 18 = 16.67m \div s$
so Kinetic energy=3000×16.67=50010 joules

Answer 2

The Kinetic energy of a moving body is given by formula :

K.E. = $\frac{1}{2}$ m v²

where,

m = mass of body in kg

v = velocity of body in m/s

Given:

m = 3000 kg

v = 60 km/hr

= 60 * 1000 / 60 * 60 m/s

= 50 / 3 m/s

Putting the values of m and v in the formula for K.E. :

K.E. = $\frac{1}{2}$ * m * v²

K.E. = $\frac{1}{2}$ * 3000 * (50/3)²

K.E = 416666.67 J

Hence,

The Kinetic enegy of a car with mass 3000 kg moving with constant velocity of 60 km/hr is 416666.67 Joules