What would happen if a cannon ball was fired at 50 mph on the truck in the same direction as the truck while the truck is also going 50 mph

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.

Ain is , is 's of ? 0.62 0.79 1.27 1.50