Answer:
Explanation:
Momentum of bigger fish = mv
= 12.5 x 0.7 = 8.75 kg.m/s
In vector form in will be in - ve x direction so
momentum = - 8.75 i
Similarly momentum of small fish
= 1.3 x 3.4 = 4.42 kg.m/s
Since the fish is going towards south so in vector form momentum
= -4.42j
Total momentum of bigger fish in vector form
= - 8.75 - 4.42j
Magnitude of momentum of bigger fish required
= √ 8.75² + 4.42² = 9.80 kg m/s
velocity of bigger fish = momentum / total mass of bigger fish
= 9.8/(12.5+1.3) = .71 m/s
= 71 cm/s
Its direction will be towards south- east making an angle as follows with east towards south
Tan θ = y component / x component
= 4.42/ 8.75 = 0.505
θ = 27 degree south of east.
