Which of the following statements is true? Thunder is caused by the heating and expansion of air.
Light travels faster than sound.
Thunderstorms are most common during the summer.
all of the above

both of them are true

Explanation:please thank me and write me with 5 stars please and thank you

both are true

Explanation:

thunder: when air molecules are heated, they expand. Sound waves move faster in warm air than they do in cool air. and The speed of light as it travels through air is much faster than that of sound.

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.