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A $^{238}U$ nucleus decays by emitting an alpha particle of speed $v\,m{s^{ - 1}}$. The recoil speed of the residual nucleus is (in $m{s^{ - 1}}$)
A smooth sphere of mass M moving with velocity u directly collides elastically with another sphere of mass m at rest. After collision their final velocities are V and v respectively. The value of v is
A body of mass m having an initial velocity v, makes head on collision with a stationary body of mass M. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will happen only when
A particle of mass m moving with a velocity $\vec V$ makes a head on elastic collision with another particle of same mass initially at rest. The velocity of the first particle after the collision will be
A particle of mass m moving with horizontal speed 6 m/sec as shown in figure. If $m < < M$ then for one dimensional elastic collision, the speed of lighter particle after collision will be Question Image
A shell of mass m moving with velocity v suddenly breaks into 2 pieces. The part having mass m/4 remains stationary. The velocity of the other shell will be
Two equal masses ${m_1}$ and ${m_2}$ moving along the same straight line with velocities + 3 m/s and – 5 m/s respectively collide elastically. Their velocities after the collision will be respectively
A rubber ball is dropped from a height of 5 m on a planet where the acceleration due to gravity is not known. On bouncing, it rises to 1.8 m. The ball loses its velocity on bouncing by a factor of
A metal ball falls from a height of 32 metre on a steel plate. If the coefficient of restitution is 0.5, to what height will the ball rise after second bounce
At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of 10 m/s. Time taken by the two radius vectors connecting point of explosion to fragments to make 90° is

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