A ball of mass $m$ moves with speed $v$ and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
A ball of mass $m$ moves with speed $v$ and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
- A
$Zero$
- B
$mv\;J$
- C
$m/v\,J$
- D
$v/m \,J$
Similar Questions
Two inclined planes are placed as shown in figure.
A block is projected from the Point $A$ of inclined plane $A B$ along its surface with a velocity just sufficient to carry it to the top Point $B$ at a height $10 m$. After reaching the Point $B$ the block slides down on inclined plane $BC$. Time it takes to reach to the point $C$ from point $A$ is $t (\sqrt{2}+1) s$. The value of $t$ is........(use $g =10 m / s ^{2}$ )
Two inclined planes are placed as shown in figure.
A block is projected from the Point $A$ of inclined plane $A B$ along its surface with a velocity just sufficient to carry it to the top Point $B$ at a height $10 m$. After reaching the Point $B$ the block slides down on inclined plane $BC$. Time it takes to reach to the point $C$ from point $A$ is $t (\sqrt{2}+1) s$. The value of $t$ is........(use $g =10 m / s ^{2}$ )
- [JEE MAIN 2022]
On complete combustion a litre of petrol gives off heat equivalent to $3\times 10^7\,J$. In a test drive, a car weighing $1200\,kg$ including the mass of driver, runs $15\,km$ per litre while moving with a uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform, calculate the force of friction acting on the car during the test drive, if the efficiency of the car engine were $0.5$.
On complete combustion a litre of petrol gives off heat equivalent to $3\times 10^7\,J$. In a test drive, a car weighing $1200\,kg$ including the mass of driver, runs $15\,km$ per litre while moving with a uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform, calculate the force of friction acting on the car during the test drive, if the efficiency of the car engine were $0.5$.
A body of mass ' ${m}$ ' dropped from a height ' ${h}$ ' reaches the ground with a speed of $0.8 \sqrt{{gh}}$. The value of workdone by the air-friction is $.....\,{mgh}$
A body of mass ' ${m}$ ' dropped from a height ' ${h}$ ' reaches the ground with a speed of $0.8 \sqrt{{gh}}$. The value of workdone by the air-friction is $.....\,{mgh}$
- [JEE MAIN 2021]
A ball is released from certain height. It loses $50\%$ of its kinetic energy on striking the ground. It will attain a height again equal to
A ball is released from certain height. It loses $50\%$ of its kinetic energy on striking the ground. It will attain a height again equal to
A spring-mass system vibrates such that mass travel on surface of coefficient of friction $\mu$. Mass is released after compressing the spring by distance a and it travels upto distance $b$ after its equilibrium position, then travelling from $x = -a$ to $x = b$ the reduction in its amplitude will be :-
A spring-mass system vibrates such that mass travel on surface of coefficient of friction $\mu$. Mass is released after compressing the spring by distance a and it travels upto distance $b$ after its equilibrium position, then travelling from $x = -a$ to $x = b$ the reduction in its amplitude will be :-