Answer:
The kinetic energy of the system after the collision is 9 J.
Explanation:
It is given that,
Mass of object 1, m₁ = 3 kg
Speed of object 1, v₁ = 2 m/s
Mass of object 2, m₂ = 6 kg
Speed of object 2, v₂ = -1 m/s (it is moving in left)
Since, the collision is elastic. The kinetic energy of the system before the collision is equal to the kinetic energy of the system after the collision. Let it is E. So,
 
 

E = 9 J
So, the kinetic energy of the system after the collision is 9 J. Hence, this is the required solution. 
 
        
             
        
        
        
Answer:
Transverse waves are always characterized by particle motion being perpendicular to wave motion. A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction that the wave moves.
Explanation:
The movement of the medium is different. In the longitudinal wave, the medium moves left to right, while in thee transverse wave, the medium moves vertically up and down. Longitudinal waves have a compression and rarefaction, while the transverse wave has a crest and a trough. Longitudinal waves have a pressure variation, transverse waves don't have pressure variation. Longitudinal waves can be propagated in solids, liquids and gases, transverse waves can only be propagated in solids and on the surfaces of liquids. Longitudinal waves have a change in density throughout the medium, transverse waves don't.
 
        
             
        
        
        
Maintenance spanner are needed in great numbers to service all sorts of technical equipment
        
             
        
        
        
Theories result from several repeated experiments.
Theories explain observations and hypotheses.
Theories may be revised over time.
Explanation:
Scientific theories are purely explanations into an observation and hypothesis. The are general binding explanations that have been developed from several tests. 
- Theories are products of different stages of experiments in their own regard. 
- For a theory to be accepted by the scientific community, its hypothesis statement must be: 
- Testable
- Repeated
- Falsifiable
- Based on new evidence, a theory may be revised with time. One of such is the Dalton's atomic theory with a modern atomic theory version now. 
Learn more: 
Experiments brainly.com/question/5096428
#learnwithBrainly
 
        
             
        
        
        
W = force * displacement
W = 32 pounds * 10 feet
Now you need to convert it to newton and meters 
W = 142 N * 3.048 m = 434 J
(I approximated the conversions- I hope it helps)