C.
The train first sped up, giving it a positive acceleration in the beginning. This eliminates D since that choice states that it begins with a negative acceleration. This also eliminates B since that choice states that the train only had a negation acceleration.
Next, the train slows down, giving it a negative acceleration. We’re looking for the answer choice that starts with a positive acceleration and ends with a negative one. This makes C the correct answer. Hope this helps!
Answer:

Explanation:
From the question we are told that:
Mass of astronaut 
Mass of tool 
Distance 
Velocity of separation 
Velocity of tool bag
Generally the equation for momentum is mathematically given by

Therefore
Initial Momentum before drop


Initial Momentum after drop

Therefore
Since 

Generally the equation for Time T is mathematically given by



Answer:
6 significant figure
Explanation:
The digits 111328 all are 6 figures with no figure being zero, neither zero after the other digits. In this case, all the numbers are significant and since they are only six numbers, then this is a six significant figure. In case we add another zero after digit 8, the zero is not significant but if added either infront of 8 or 2, the zero becomes significant.
Answer:
Explanation:
Given
mass of ice cube 
inclination 
Spring constant 
initial compression 
Suppose Initially the cube is at the datum and it moves h height after release
So Elastic Potential Energy of Spring will convert to Potential Energy of cube



so final Potential Energy will be
Initial Potential Energy
B.Initially spring is at compression so energy associated with it is its Elastic Potential Energy i.e. 0.125 J
Final Energy