A river of salty water is flowing with a velocity 2 `ms^(-1) `  If the density of the water is 1.28 c `c^(-1)`, then the kinetic momentum during a collision, the condition is energy of each cubic meter of water is

Options

A. 2.4j
B. 24 j
C. 2.4 kj
D. 4.8 kj

Answer

c

Explanation

Mass of s cubic meter of water,
`m=(1.2xx10^(-3))/((10^(-2))^(3))=1.2xx10^(3)kg `
Kinetic energy per cubic meter of water , `K.E =1/2mv^(2)=1/2xx1.2xx10^(3)xx2^(2)=2.4xx10^(3)=2.4Kj`