A body of mass $m$ collides against a wall with a velocity $v$ and rebounds with the same speed. Its change of momentum is
$2\, mv$
$mv$
$-mv$
Zero
(a)$\Delta p = {p_i} – {p_f} = mv – ( – mv) = 2\,mv$
A solid horizontal surface is covered with a thin layer of oil. A rectangular block of mass $m =0.4 kg$ is at rest on this surface. An impulse of $1.0 N s$ is applied to the block at time $t =0$ so that it starts moving along the $x$-axis with a velocity $v ( t )= v _0^{ e ^{-1 / \tau}}$, where $v_0$ is a constant and $\tau=4 s$. The displacement of the block, in metres, at $t=\tau$ is. . . . . . . Take $e ^{-1}=0.37$
Action and reaction forces act on
Swimming is possible on account of
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