Question

A child is pushed down a slide from a height of 2.5m with a speed of 7m/s if his mass is 25kg and reaches the ground a speed of 5m/s calculate the coefficient of kinetic friction. Theta = 55 degrees

Answer 1

mu = Ff/Fn

for Ff use energy
mgh + 1/2 mv^2 - Ff(d) = 1/2 mv^2
d is h/sin55
for Fn do a free body
Fn = mg cos55 (I think, check it)