A ball is thrown straight upward. Neglecting air resistance, what initial up-
ward speed does the ball need in order to remain in the air for a total time of 10 sec be- fore it is caught at the initial point of release?

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?

What are atoms of the same element with varying number of neutrons

The softest and hardest minerals are: softest hardest