Question

Two spacemen are floating together with zero speed in a gravity-free region of space. The mass of spaceman A is 120 kg and that of spaceman B is 90 kg. Spaceman A pushes B away from him with B attaining a final speed of 0.5 m/s. The final recoil speed of A is: Select one: a. zero b. 0.67 m/s c. 1.0 m/s d. 0.5 m/s e. 0.38 m/s

Answer 1

Answer:

e.0.38m/s

Explanation:

here

m1=120kg

u1=0

v1=?

m2=90kg

u2=0

v2=0.5m/s

from law of conservation of momentum,

m1u1+m2u2=m1v1+m2v2

0+0=120v1+45

v1=-45/120

v1 =-0.38m/s

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