A boy on a skateboard is pushed down the sidewalk by a friend. The skateboard rolls for a while but eventually comes to a stop.
What force is causing the skateboard to stop rolling?
2 answers:
Friction is causing the skateboard to stop rolling.
Friction is the force causing it
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Answer:
d= 1.5 g/cm3
Explanation:
datos
m= 30g
v= 20cm3
d=?
formula
d= m / v
solución
d= 30g / 20cm3 = 1.5g/cm3
F = ma
We have mass = 0.2kg
and acceleration = 20 m/s^2
So..
F = (0.2)(20)
F = 4 N
Designing warning and evacuation systems could be a step in a plan designed to mitigate the negative impacts of a natural hazard.
You cant skip nothing. All the lessons are important! Sorry about you free time :/
Using
KE = ½mv² = ½×1500×19×19 = 270750 joules
