So the initial velocity is 15 m/s, the final velocity is 0 since it's at a complete stop and time is 10 seconds.  Therefore:

Therefore, the acceleration is -1.5 m/s^2.  The reason it's negative is due to the fact that the vector is going against it's original movement since it's decelerating. 
 
        
                    
             
        
        
        
Answer:
140m east
Explanation:
If East is positive then lets rephrase the problem into integers
 A truck moves +70 m, then moves -120m, and finally moves +90m.
So totally Displacement = +70-120+90= +140m
Since east is positive, the trucks resultant displacement is 140 m east of origin
 
        
             
        
        
        
Answer:
ε = 6.617 V
Explanation:
We are given;
Number of turns; N = 40 turns 
Diameter;D = 18cm = 0.18m
magnetic field; B = 0.65 T
Time;t = 0.1 s
The formula for the induced electric field(E.M.F) is given by;
ε = |-NAB/t|
A is area
ε is induced electric field
While N,B and t remain as earlier described. 
Area = π(d²/4) = π(0.18²/4) = 0.02545
Thus;
ε = |-40 × 0.02545 × 0.65/0.1|
ε = 6.617 V
(we ignore the negative sign because we have to take the absolute value) 
 
        
             
        
        
        
Answer:
0.09 x10^-10m
Explanation:
Using wavelength=( 12.27 A)/√V
 = 12.27 x 10^-10/ √1.6x10^2
= 0.09x10^-10m