It will decay into Silicon-30. Because alpha particles are 2 protons and 2 neutrons with an atomic mass of 4, you minus sulfur's atomic number by 2 and get silicon. And the atomic mass is 34 - 4 which equals 30.
        
             
        
        
        
Answer:

Explanation:
Speed is equal to distance over time. 

The distance is 400 meters and the time is 50 seconds.

Substitute the values into the formula. 

Divide. 

The speed of the car is 8 meters per second.