Desde la azotea de un edificio de 27m de altura, se lanza verticalmente y haci arriba una piedra con una velocidad de 30m/s. Calcular: a) velocidad a los 2s, b) altura a los 2 segundos, c) velocidad a los 5s, d) altura los 5s, e) en cuánto tiempo llega al suelo.​

What are the factors that affect the resistance of a wire?

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.