For constant acceleration along a given direction, we can relate acceleration, velocity and position with the following equation that doesn't involve time:
In this equation x is the final position, which we take to be 0. Also the initial velocity Vo is zero. Thus the equation simplifies to
Putting in v=32m/s, a=-9.81m/s^2 gives
At any crime scene, the two greatest challenges to the physical evidence are contamination and loss of continuity.
<h3>What is the meaning of physical evidence?</h3>
In evidence law, physical evidence (also called real evidence or material evidence) is any material object that plays some role in the matter that gave rise to the litigation, introduced as evidence in a judicial proceeding (such as a trial) to prove a fact in issue based on the object's physical characteristics.
The two types of evidence at crime scenes:
Biological evidence (e.g., blood, body fluids, hair and other tissues)
Latent print evidence (e.g., fingerprints, palm prints, footprints)
The biggest impediment to an investigation is the removal or loss of a piece of evidence from the scene of a crime.
Hence, at any crime scene, the two greatest challenges to the physical evidence are contamination and loss of continuity.
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Answer:
The greater the luminosity of a star, the longer its period of oscillation.
shape and yeah so you must find objects speed to determine the shape
Two large blocks of wood are sliding towards each other on the frictionless surface of a frozen pond. The blocks collide head-on. Then the decrease in total kinetic energy after the collision is 13.18 J.
From the law of conservation of linear momentum, we know, Pi = Pf
where, Pi is total initial momentum
Pf is total final momentum
m₁u₁ + m₂u₂ = M₁V₁ + M₂V₂
4*2 + 6*(-2.5) = 4* V₁ + 6*(0.5)
4V₁ = 8 - 15 -3
V₁ = -2.5 m/s
Now, let us calculate the initial and final kinetic energies.
The formula to find out kinetic energy is K.E = 1/2 mv²
Initial kinetic energy = 1/2* 4* 2² + 1/2* 6* (-2.5)² = 26.75 J
Final kinetic energy = 1/2* 4* 2.5² + 1/2* 6* (-0.5)² = 13.57 J
The difference in total kinetic energy is K₂ - K₁ = (13.57 - 26.75) = -13.18 J
Thus, the decrease in total kinetic energy of the given blocks after collision is 13.18 J.
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