An astronaut with a mass of $75 kg$ is floating in space. If the astronaut throws an object with a mass of $2 kg$ at a speed of $5/4 m/s$ , how much will his speed change by?

Question

1887 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-03-04T07:16:00

The speed of the astronaut will change by $=1/30ms^-1$

$m_1u_1+m_2u_2=m_1v_1+m_2v_2$

The mass of the astronaut is $m_1=75kg$

The mass of the object is $m_2=2kg$

As the astronaut is floating in space initially,

$u_1=u_2=0ms^-1$

The speed of the object is $v_2=5/4ms^-1$

Therefore,

$75v_1+5/4*2=0$

The speed of the astronaut is $v_1=-5/4*1/75*2=-1/30ms^-1$

An astronaut with a mass of 75 kg75 kg is floating in space. If the astronaut throws an object with a mass of 2 kg2 kg at a speed of 5/4 m/s5/4 m/s, how much will his speed change by?