Asled of mass m starts from rest at the top of a hemispherical frictionless hill of radius r.

a) use conservation of mechanical energy to find an expression for the sled’s speed when it is at an angle ∅.
b) use newton’s 2nd law and ideas of circular motion to find the maximum speed the sled can have at angle without leaving the surface.
c) at what angle ∅_max does the sled "fly off" the hill?

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

wavelength divides in half and speed stays the same.

cant without the picture! ?