Answer:
0.0072
Explanation 
7.2x10^-3= 0.0072
        
             
        
        
        
Answer:
The time is 
Explanation:
Given that,
Capacitor = 120 μF
Voltage = 150 V
Resistance = 1.8 kΩ
Current = 50 mA
We need to calculate the discharge current
Using formula of discharge current

Put the value into the formula


We need to calculate the time
Using formula of current

Put the value into the formula





Hence, The time is 
 
        
             
        
        
        
Answer:
+ 5 m/s
Explanation:
change in displacement = ΔX=final position - initial position 
                                             ΔX = 0-(-5) =0+5 =+ 5 m 
average velocity =  ΔX/t
                              = +5/1
                              = + 5 m/s 
positive sign shows that ball rolls towards right 
 
        
             
        
        
        
20N•m or 20J. Work is equal to force•distance, and 5N•4m is 20N•m, or J