A model rocket starts from rest on a horizontal frictionless rail

PHYSICS · Subjective · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

0.12\,\text{kg}

model rocket starts from rest on a horizontal frictionless rail. Its engine produces a constant horizontal thrust of

9.0\,\text{N}

for the first

0.80\,\text{s}

while a resistive force of

0.20\,\text{N}

opposes the motion the entire time. After the engine cuts off, only the

0.20\,\text{N}

resistive force acts for another

1.20\,\text{s}

. Calculate the rocket’s linear momentum (magnitude and direction) exactly

2.0\,\text{s}

after launch.