Force = (mass) x (acceleration)
= (0.025 kg) x (5 m/s²)
= 0.125 Newton
Here as we know that there is no loss of energy
so we can say that maximum kinetic energy will become gravitational potential energy at its maximum height
So here we have

here we have
v = 20 m/s
m = 8000 kg
now from above equation we have



so maximum height is 20.4 m
Answer:
Steel is almost 2.9 times heavier the aluminium.
If she only has 21 buttons and all 21 of them are large, then all of her buttons are large. so 100% of the buttons would be large.