Question

A body is moving with velocity 4 m/s , possesses 56 Joules of Kinetic Energy. The momentum of body w
ill be equal to

Answer 1

Answer:

28kg-m/sec

Explanation:

kinetic energy will be given by the formula,

KE=1/2(mv^2),

=>56=1/2(m*4^2),

=>112=16m,

=>m=7kg.

then,momentum of body will be ,

m*v=7*4=28kg-m/sec.

Answer 2

Answer:

The momentum of body will be equal to 28Kgms⁻¹.

Explanation:

Given:

• Mass= m in Kg

• Velocity ,v =4m/s
• Kinetic energy KE =56 joules
• Momentum P=mxv
• kinetic energy is the half of the product of mass and square of velocity.

$K.E. =\frac{1}{2}mv^{2} \\56=\frac{1}{2}\times\mathram m\times\mathram 4^{2} \\56= 8m\\m=7kg$

$w=m\times\mathram g\\w=7*10= 70N\\Momentum, P=m\times\mathram v$

$P= 7\times4=28 Kgms^{-1}$