A Proton, Which Has a Mass Of $1.67 \times 10 ^ { - 27 }$

Multiple Choice

A proton, which has a mass of $1.67 \times 10 ^ { - 27 }$ , is moving at $0.80 c$ relative to the laboratory. What does a physicist in that lab measure for its momentum? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

A) $6.7 \times 10 ^ { - 19 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }$
B) $5.8 \times 10 ^ { - 19 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }$
C) $4.0 \times 10 ^ { - 19 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }$
D) $5.0 \times 10 ^ { - 19 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }$
E) $4.4 \times 10 ^ { - 19 } \mathrm {~kg} \cdot \mathrm { m } / \mathrm { s }$