Aslingshot fires a pebble from the top of a building at a speed of 15.0 m/s. the building is 30.0 m tall. ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired.
(a) horizontally,
(b) vertically straight up,
(c) vertically straight down.

V=28.5m/s

b=V=28.5m/s

c=V=28.5m/s

Explanation:

A slingshot fires a pebble from the top of a building at a speed of 15.0 m/s. The building is 30.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the pebble is fired.

(a) horizontally,

(b) vertically straight up,

(c) vertically straight down.

u=15m/s

yi=30m

v=?

yf=0

system=pebble+earth

workdone=0

chnage in energy=0

ki+Ui=Kf+Ui

K=kinetic energy

U=potential energy

1/2mv^2+mgyf=1/2mu^2+mgyi

V^2=u^2+2gyi

V=

V=28.5m/s

b. and c will be the same as a. because the magnitude of the kinetic energy is dependent on the velocity and not the magnitude which the pebble is tilted at

a) are muscles that have bands.

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freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.