Class 11

Physics

Mechanics

Work Power And Energy

A body starts from rest and moves with uniform acceleration. What is the ratio of kinetic energies at the end of $1st,2nd$ and $3rd$ seconds of its journey ?

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The spring block system lies on a smooth horizontal surface. The free endof the spring is being pulled towards right with constant speed $v_{0}=2m/s.$ At $t=0sec$, the spring of constant $k=100N/cm$ is unsttretched and the block has a speed $1m/s$ to left. The maximum extension of the spring is. .

A projectile is fixed on a horizontal ground. Coefficient of restitution between the projectile and the ground is 'e'. If $a,b$ and $c$ be the ration of time of flight $[T_{2}T_{1} ]$, maximum height $[H_{2}H_{1} ]$ and horizontal range $[R_{2}R_{1} ]$ in first two collisions with the ground, then

A ball is released from point A as shown in figure. The ball leaves the track at B. All surfaces are smooth. If track makes an angle $30_{∘}$ with horizontal at B, then maximum height attained by ball will be

The length of ballistic pendulum is $1m$ and mass of its block is $0.98kg.$ A bullet of mass $20$ gram strikes the block along horizontal direction and gets embedded in the block. If block + bullet completes vertical circle of radius $1m$, then the striking velocity of bullet is

A rubber ball drops from a height 'h'. After rebounding twice from the ground, it rises to $h/2.$ The co-efficient of restitution is

A ball of mass 'm' moving with a horizontal velocity 'v' strikes the bob of mass 'm' of a pendulum at rest. During this collision, the ball sticks with the bob of the pendulum. The height to which the combined mass raises is (g = acceleration due to gravity).

A $1kg$ ball moving at $12m/s$ collides head on with a $2g$ ball moving in the opposite direction at $24m/s.$ The velocity of each ball after the impact, if the coefficient of restitution is $2/3$ is

A shot is fired at $30_{∘}$ with the vertical from a point on the ground with kinetic energy $K.$ If air resistance is ignored, the kinetic energy at the top of the trajectory is