An object of mass $m$ is projected with a momentum $p$ at such an angle that its maximum height is $\frac{1}{4}$ th of its horizontal range. Its minimum kinetic energy in its path will be
$\frac{p^2}{8\,m}$
$\frac{p^2}{4\,m}$
$\frac{3 p^2}{4\,m}$
$\frac{p^2}{m}$
A body of mass $m$ is projected at an angle of ${45^o}$ with the horizontal. If air resistance is negligible, then total change in momentum when it strikes the ground is
A man weighing $80\, kg$ is standing in a trolley weighing $320 \,kg$. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of $1 \,m / s$, then after $4\, sec$ his displacement relative to the ground will be ........ $m$
In a tug-of-war contest, two men pull on a horizontal rope from opposite sides. The winner will be the man who
A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of $12 \;m/ s$.
If the mass of the ball is $0.15 \;kg$, determine the impulse (in $N\;s$) imparted to the ball. (Assume linear motion of the ball)