Collisions, Momentum and Kinetic Energy

The momentum is given by mass times it's velocity, and it is a vector quantity with direction same as velocity. The question states momentum is mass times it's speed, which is incorrect since it gives a scalar value. Hence the statement is false and correct answer is B.

The initial momentum of ball $P _1 = m\vec{v} $, after batsman hits ball and reverses its direction, momentum of ball $P _2= -m\vec{v} $
Magnitude of change in momentum $\Delta p = \left | P _2-P _1\right | =\left | - 2m \vec{v}\right | =2m \left | \vec{v}\right | $ 
from data given in question $  m=0.15 kg ;\;  \left | \vec{ v} \right |= 12m/ s$
$\Delta P=2\times 0.15\times 12= 3. 6 kg m/ s $

Momentum is  the quantity of motion of a moving body, measured as a product of its mass and velocity.

$\Delta P = F\Delta t = 10 \times 10 = 100 kg m/s$

If the collision of the ball and the wall is elastic one then the change in the momentum of the ball after collision is $= mu-(-mu)=2mu$ away from the wall.

Given :   $m = 10$ kg             $v = 36$ km/hr $ = 36\times \dfrac{5}{18}  = 10$ m/s

For metallic ball,

Momentum is product of mass and velocity.

Initial momentum of the ball $=P$

$\Delta P={ P } _{ 1 }-{ P } _{ 2 }$ $[$ change in momentum$]$

Forces that do not store energy are called nonconservative or dissipative forces. Friction is a nonconservative force, and there are others. Any friction-type force, like air resistance, is a nonconservative force.

change in momentum = 5 (40 - 30) = $50kgm/s$

$momentum=mass*\delta v=5kg*(20-0.20)=99kgm/s$

P =mv = 0.1 x 15 $kgm/s$ = 1.5$kgm/s$

Momentum of the body is defined as the product of mass of the body and its velocity.