A rocket with a mass of 750 grams is launched straight up.It achieves a velocity of 25.00 m/s in 2.00 seconds.The average net force on the rocket is
A) 16.7 N.
B) 24.5 N.
C) 33.1 N.
D) 41.7 N.
E) 52.8 N.

Question

Quizplus · Accepted Answer

The average net force on the rocket is equal to its mass times its acceleration. The acceleration of the rocket is equal to its change in velocity divided by the time it takes to make that change. The change in velocity is 25.00 m/s - 0 m/s = 25.00 m/s. The time it takes to make that change is 2.00 seconds. Therefore, the acceleration of the rocket is 25.00 m/s / 2.00 seconds = 12.50 m/s^2. The mass of the rocket is 750 grams, which is equal to 0.750 kilograms. Therefore, the average net force on the rocket is 0.750 kilograms * 12.50 m/s^2 = 9.38 Newtons.

A Rocket with a Mass of 750 Grams Is Launched