EXERCISE

Two balls having linear momenta ${\overrightarrow{p}}_1=p\hat{\mathrm{i}}$ and ${\overrightarrow{p}}_2=-p\hat{\mathrm{i}}$, undergo a collision in free space. There is no external force acting on the balls. Let ${\overrightarrow{p}}_1^{\text{'}}$ and ${\overrightarrow{p}}_2^{\text{'}}$ be their final momenta. The following option (s) is (are) not allowed for any non-zero value of $p, a_1, a_2, b_1, b_2, c_1$ and $c_2$.

The difference between the working of a jet and a rocket is

A particle is observed to be at rest in a particular frame of reference. From this observation we can conclude that

The displacement of a particle at time $t$ is given by $s=a{t}^2-b{t}^3$. So we can predict that

A reference frame attached to the earth

A body of mass $m$ is thrown with a velocity $v$ at an angle of $45°$ with the horizontal. The body traverses a parabolic path and comes back to the ground. The change in momentum between the two instants when it was thrown and when it was about to strike the ground is

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