Answer:
19.2m/s 
Explanation:
Assuming that 2.4m/s^2 was the acceleration and not a typo, we can use the equation v=at, where v=velocity, a=acceleration, and t=time,
plug in known varibles,
v=2.4*8
v=19.2m/s
 
        
             
        
        
        
Efficiency is calculated through dividing the actual mechanical advantage by the hypothetical mechanical advantage:
- the actual mechanical advantage is 9J because that's how much work the light bulb doing
- the hypo. mechanical advantage is 100J. Ideally, in a perfect world, the light bulb can convert 100J input into 100J output, but do to resistance and other factors it is not possible.

change the decimal to a percentage:

the light bulb had 9% efficiency
 
        
        
        
Answer
Given,
Average speed of Malcolm and Ravi = 260 km/h
Let speed of the Malcolm be X and speed of the Ravi Y.
From the given statement

 ....(i)
 ....(i)
 ....(ii)
  ....(ii)
Adding both the equations
 3 X = 600 
  X = 200 km/h
Putting value in equation (i)
 Y = 520 - 200
 Y = 320 Km/h
Speed of Malcolm = 200 Km/h
Speed of Ravi = 320 Km/h
 
 
        
             
        
        
        
 root mean square<span>= square root of ( 3RT/M) 
 R = 8.314 J/K/mole 
T = 25 + 273 = 298 K 
M = molecular mas of N2 in kg = 28 X 10^-3 kg 
put values... 
</span><span> root mean square</span> = square root of ( 3 X 8.314 X 298/28 X 10^-3) 
= square root of ( 265454.143) 
= 515.2 m/s
so option A is right
hope this helps
        
             
        
        
        
Answer:
12.267 seconds approximately. 
Explanation:
The units can be simplified into m/s, in which case you would have 61000/3600. Simplify that to 16 and 17/18. This is your meters per second, so multiply that by .724 to get the answer.