Answer:
The larger pebble has 25 times more mass.
Explanation:
To solve the exercise it is necessary to apply the work and energy conservation equations.
For the case described, the work done must be preserved and must be the same, that is,

By definition work linked to the conservation of kinetic energy would be given by






The ratio between the mass and the velocity would be,



Therefore the answer is: The larger pebble has 25 times more mass.
Answer:
120 watts
Explanation:
#1: 120 watts
#2: 667 watts
#3: 3 watts
#4: i forgot how to do this one