A space probe travels directly outward from Earth

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A space probe travels directly outward from Earth. At

t=0

it is at

x=0\,\text{m}

. At

t=20\,\text{s}

it is at

x=400\,\text{m}

. At

t=50\,\text{s}

its velocity is measured to be

28\,\text{m/s}

outward. Assuming the probe’s acceleration is constant, what is its position at

t=80\,\text{s}

? (a)

2.2\times10^{3}\,\text{m}

(b)

2.1\times10^{3}\,\text{m}

(c)

2.9\times10^{3}\,\text{m}

(d)

1.8\times10^{3}\,\text{m}