If the kinetic energy $(K.E.)$ of a particle is doubled,then its momentum will

When the mass and speed of the body are doubled,the kinetic energy of the body

$A$ boy is rolling a $0.5\, kg$ ball on a frictionless floor with a speed of $20\, ms^{-1}$. The ball gets deflected by an obstacle on the way. After deflection,it moves with $5\%$ of its initial kinetic energy. What is the speed of the ball now? (in $ms^{-1}$)

The momentum of an object increases by $50\%$. By what percentage will its $K.E.$ increase?

The kinetic energy of an object decreases by $19\%$. What is the percentage decrease in its momentum?

The kinetic energy of a car is doubled when its velocity is increased by $1 \,m/s$. Then the initial velocity of the car is