I did
F = ma
F = 12000*1.4
F = 16800
so I ticked A but the answer is actually C
can someone explain how please

You forgot to account for the acceleration due to the gravity of the earth (9.8 m/s²).

The net force must equal the force from thrust minus force of gravity because thrust pushes upward, but gravity pushes downward. The leftover force is the net force where the rocket will be going.

Rearrange the equation to find for F_thrust.

F_net = F_Thrust - F_gravity

F_thrust = F_Net + F_gravity

We're given the net acceleration of the rocket, 1.4m/s, so we can use that to calculate the net force.

F = ma

F = (12000)(1.4)

F = 16800

Then there's the acceleration due to gravity. So the force of that is.

F = ma

F = (12000)(9.8)

F = 117600

Add them up and you get:

F_thrust = F_Net + F_gravity

F_thrust = 16800 + 117600

F_thrust = 134400 N

C

Explanation:

Net force = ma

Net force = Thrust- weight

Thrust - (12000 × 9.8) = 12000(1.4)

Thrust = 16800 + 117600

= 134400

= 1.344 × 10⁵

what are the options.

explanation:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.