What is the force acting on a ball at the top of its orbit?

[buffgilville]

A ball of mass 1.6 kilograms is projected with a velocity 16.6 m/s in a direction 74.7 degrees from the horizontal. The acceleration due to gravity is g = 9.81 m/s2. What is the force acting on the ball when it is at the uppermost point in its orbit?

Is the force acting on the ball zero because it is at the edge with no acceleration.
F=ma so (1.6kg * 0m/s^2)

 

[vsage]

The force due to gravity is essentially constant close to the Earth's surface.

 

[Romperstomper]

It's not zero acceleration when it's at the peak, it's zero velocity. It has a negative acceleration that slows it down to it's peak.

 

[Pyrrhus]

Try using convervation of mechanical energy, it'll help.