Answer :
Since the momentum remains same before and after push-off, therefore Tracey's speed will be 0.492 m/s.
Momentum is a product of mass and the velocity of a body.
- The SI unit for momentum is kg-m/s
- It is a vector quantity and has the direction same as that of the velocity of the object.
- It is represented by M and mathematically, M = Mass * Velocity
The initial momentum is always equal to the final momentum during collisions between two bodies.
Therefore; M₁U₁ +M₂U₂ = M₁V₁+ M₂V₂,
where M₁ is the mass of Tracey
M₂ is the mass of Jonas,
U is the initial velocity
V is the final velocity.
(32 ×0)+ (45×0) = (32 × V₁) + (45 × 0.35)
0 = 32V₁ + 15.75
32 V₁ = - 15.75
V₁ = - 0.492 ( negative sign indicates difference in direction)
There, Tracey's speed will be 0.492 m/s.
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