Question

Камень брошен вертикально вверх. через 0,5 с после броска его скорость равна 10 м/с.чему равна начальная скорость камня? Сопротивление воздуха не учитывать. (30 баллов)

Answer 1

Дано Vy=10 м\с    t=0,5 с    Voy-?

Vy=Voy-g*t

Voy=Vy+g*t=10+5=15 м\с

Answer 2

Calculation of Initial Velocity of the Stone

To calculate the initial velocity of the stone, we can use the equation of motion for an object in free fall. The equation is:

v = u + gt

Where: - v is the final velocity (which is 0 m/s when the stone reaches its highest point) - u is the initial velocity (what we want to find) - g is the acceleration due to gravity (approximately 9.8 m/s^2) - t is the time taken (0.5 s in this case)

Rearranging the equation to solve for u, we have:

u = v - gt

Since the final velocity is 0 m/s at the highest point, we can substitute that value into the equation:

u = 0 - (9.8 m/s^2)(0.5 s)

Evaluating the equation, we find:

u = -4.9 m/s

Therefore, the initial velocity of the stone is -4.9 m/s when it is thrown vertically upwards.

Please note that the negative sign indicates that the stone is moving in the opposite direction to the positive direction we have chosen. In this case, it means that the stone is moving upwards.