The rocket reached a speed of 100 m / s in the first 5 seconds, what is the weight of an astronaut if his mass is 70 kg?

Given:

V = 100 m / s – rocket speed;

t = 5 seconds – the time during which the rocket speed reached the value V;

g = 10 m / s ^ 2 – acceleration of gravity;

m = 70 kg is the mass of the astronaut.

It is required to determine the weight of the astronaut P (Newton).

The acceleration with which the rocket moves:

a = V / t = 100/5 = 20 m / s ^ 2 – directed vertically upward.

Then:

P = m * (g + a) = 70 * (10 + 20) = 70 * 30 = 2100 Newtons.

Answer: the weight of the astronaut is 2100 Newtons.