Una bala de masa m [kg] choca contra un bloque de M [kg] que cuelga del techo por una cuerda. La bala queda incrustada en el bloque y ambos se elevan una altura h
[m]. Encuentre una expresión para la velocidad de la bala antes del choque.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

See the attachment and solve question 5th

Sound travels slower in colder air that it does in warmer air. make a claim about the effect of air temperature on the speed of sound. support your claim with evidence