Answer to Question #109745 in Mechanics | Relativity for sdf

Question #109745
Hobbes, the stuffed tiger, has a mass of 28.4 kg. Calvin, the little boy, has a mass of 17.7 kg. In a game of football, Hobbes runs to the right (towards Calvin) at 9.2 m/s. Calvin runs to the left (towards Hobbes) at 12.0 m/s. The two collide and stick together.



What is their final velocity? (Assume that velocities to the right are positive.)
1
Expert's answer
2020-04-15T10:37:23-0400

As per the given question,

mass of the Hobbes (m)=28.4kg(m)=28.4 kg

mass of the little boy kelvin(m1)=17.7kg(m_1)=17.7 kg

Speed of the Hobbes (u)=9.2 m/sec

Speed of the kelvin (u1)=12m/sec( u_1)=12 m/sec

They are running opposite to each other and after the collision, they are getting stick, let the final speed becomes V,

Now, applying the conservation of momentum,

mu+m1u1=(m+m1)V\Rightarrow mu+m_1u_1=(m+m_1)V

Now, substituting the values, in the above,

V=28.4×9.217.7×1228.4+17.7\Rightarrow V=\dfrac{28.4\times9.2-17.7\times 12}{28.4+17.7} m/sec

V=48.8846.1m/sec\Rightarrow V=\dfrac{48.88}{46.1}m/sec

V=1.06m/secV=1.06m/sec


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