Starting from rest, a ball of mass 2 kg is accelerated at 4 m/s^2 for 3 s. What is the final kinetic energy (in J) of the ball after 3 s?

144 joules

Explanation:

v=initial velocity+(acceleration × time)

v=0+(4×3)

v=12m/s

k.e =0.5 × mass × velocity^2

=0.5 × 2 × 12^2

=1 × 144

=144 joules

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.