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# Answer to Question #111199 in Mechanics | Relativity for Sam

Question #111199
A jet car can accelerate from stationary to 200ms-1 in 5.3 seconds. If its mass is 1200kg, calculate the average thrust it achieves during that time.
1
2020-04-23T12:42:45-0400

Explanation

• Momentum of the car changes from zero to some amount within a certain time.
• For a momentum change, there should be some kind of force/trust acting on it during that period.
• That average force/trust is calculated by, "\\small F = \\frac{\\small\\text{Final momentum}-\\small\\text{Initial momentum}}{\\small \\text{time}}"

Calculations

"\\qquad\n\\begin{aligned}\n\\small \\text{Thrust} &= \\small \\frac{mv-mu}{t}\\\\\n&= \\small \\frac{m(v-u)}{t}\\\\\n&= \\small \\frac{1200kg\\times(200ms^{-1}-0ms^{-1})}{5.3s}\\\\\n&= \\small \\bold{45283.02 \\,N}\n\\end{aligned}"

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