A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved ?
Momentum and kinetic energy
Kinetic energy alone
Momentum alone
Neither momentum nor kinetic energy
A particle of mass $m$ moving horizontally with $v_0$ strikes $a$ smooth wedge of mass $M$, as shown in figure. After collision, the ball starts moving up the inclined face of the wedge and rises to $a$ height $h$. The maximum height h attained by the particle is
Write the principle of conservation of mechanical energy for non-conservative force.
A bomb is projected upwards. At topmost point it explodes in three identical fragments. First fragment comes to ground in $10\ sec$. and others in $20\ sec$ each. Then the height reached by the original bomb is.........$m$
A ball is dropped from height $10 \,m$. Ball is embedded in sand $1 \,m$ and stops, then
$Assertion$ : A helicopter must necessarily have two propellers.
$Reason$ : Two propellers are provided in helicopter in order to conserve linear momentum