Question

This problem, a squid at rest suddenly sees a predator coming toward it and needs to escape. Assume the following:______.

Answer 1

Answer:

6.79 m/s

Explanation:

By applying the principle of conservation of momentum.

The total momentum = MV - mv = 0 (since the squid is beginning at rest)

the mass of the squid (M) in absence of water in its cavity = (6.5 - 1.75) kg

= 4.75 kg

speed of the squid (V) = 2.5 m/s

mass of the water expelled (m) = 1.75 kg

speed of the water (v) = ???

∴

4.75 × 2.5 = 1.75 × v

$v = \dfrac{4.75 \times 2.5}{1.75 }$

v = 6.79 m/s