A person jumps straight upward by pushing downward on Earth with an average force of for

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

Problem

70\,\text{kg}

person jumps straight upward by pushing downward on Earth with an average force of

800\,\text{N}

for

0.30\,\text{s}

. Assuming Earth’s mass is

6.0\times10^{24}\,\text{kg}

, which of the following is the BEST estimate of Earth’s change in speed as a result of the jump? (a)

6\times10^{-24}\,\text{m/s}

(b)

1.3\times10^{-22}\,\text{m/s}

(c)

4\times10^{-23}\,\text{m/s}

(d)

4\times10^{-21}\,\text{m/s}