Urgent: when a bat hits a ball, the impulse is

a)the change in velocity multiplied by force*
b) the mass multiplied by force
c) the mass multiplied by acceleration
d) the force multiplied by the time the objects are in contact

*i think it's a

The plum pudding model of the atom state that ?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.