The gun was fired vertically upwards with an initial speed of 300 m / s. What speed will be in 1.5 sec.

Initial data: V0 (initial velocity of the body after the shot) = 300 m / s; t (time after firing) = 1.5 s.

Reference values: a (acceleration of the body, slow motion of the body) = -g (acceleration of gravity) = -10 m / s ^ 2.

The speed of the body in 1.5 s is determined from the formula: V = V0 + a * t = V0 – g * t.

Let’s calculate: V = 300 – 10 * 1.5 = 300 – 15 = 285 m / s.

Answer: After 1.5 s, the speed will be 285 m / s.