Answer:
a)  19440 km/h²
b) 10 sec 
Explanation:
v₀ = initial velocity of the car = 45 km/h
v = final velocity achieved by the car = 99 km/h
d = distance traveled by the car while accelerating = 0.2 km 
a = acceleration of the car 
Using the kinematics equation 
v² = v₀² + 2 a d 
99² = 45² + 2 a (0.2)
a = 19440 km/h²
b) 
t = time required to reach the final velocity 
Using the kinematics equation 
v = v₀ + a t 
99 = 45 + (19440) t
t = 0.00278 h 
t = 0.00278 x 3600 sec 
t = 10 sec 
 
        
             
        
        
        
"Accuracy" would be the best option from the list regarding the property of a measurement that is best estimated from the percent error, since the higher the error is the lower the accuracy. 
Explanation:
When taking scientific measurements, it's vital to be each correct and precise. Accuracy represents however shut a mensuration involves its true price. This can be vital as a result of unhealthy instrumentality, poor processing or human error will result in inaccurate results that aren't terribly getting ready to the reality.
 
        
                    
             
        
        
        
Answer:48.2 Joules 
Explanation:
Given
two masses of 0.2 kg and 0.4 kg collide with each other 
after collision 0.2 kg deflect 30 north of east and 0.4 kg deflects 53.1 south of east 
Velocity of 0.2 kg mass is 


Velocity of 0.4 kg mass


Thus total Kinetic energy 
Kinetic energy=48.2 J