Question

2A 5-kilogram rocket is projected upward from rest by an engine/applied force equivalent to 80-Newtons. After firing for 4-seconds the engine turns off. A. Draw and label all of the forces acting on the rocket at each of the intervals shown above. B. Determine the initial upward acceleration of the rocket during the first 4-seconds.

Answer 1

Answer:

(A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

Explanation:

Given that,

Mass of rocket = 5 kg

Force = 80 N

Time = 4 sec

(A). We need to draw the figure

The force acting on the rocket at each of the intervals is shown in figure.

The force acting on the rocket is mg.

(B). We need to calculate the initial upward acceleration of the rocket

Using balance equation

$ma=F-mg$

$a=\dfrac{F-mg}{m}$

Put the value in the equation

$a=\dfrac{80-5\times9.8}{5}$

$a=6.2\ m/s^2$

Hence, (A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²