A cannon that sits 1.3m off the ground, shoots a 14kg into the air vertically at 9.6 m/s. What is the acceleration of the ball at its
highest point?

0 m/s2

Explanation:

Since the peak of the ball is when there is no acceleration in the y direction (it is just floating in air for a point in time), and the ball is being shot vertically, the acceleration at its highest point is 0.

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.