Question

Compare the kinetic energy is of two objects

having masses 10 KG and 15 KG respectively moving at speed of 36 km/h and 72 km/h

respectively. ​

Answer 1

Explanation:

Kinetic Energy = 1/2 x mass of object x velocity^2

I,e. EK = 1/2*m*v^2

for 1st object Kinetic energy will be:

1/2*10*36*36

1*10*36*18

= 6,480 J

for 2nd object Kinetic energy will be:

1/2*15*72*72

1*15*72*36

= 38,880 J

so the kinetic energy is greater for the second object.

J = joule (unit for energy)

Hope this helps!

Answer 2

Explanation:

We know that

P = m.v

K.E = ½mv²

K.E= ½(mv).v

we can prove

$k.e = \frac{p {}^{2} }{2m}$

calculate using formula and campare