Final answer:
During liftoff, if astronauts feel an acceleration of 1.4g, the actual acceleration is calculated as 1.4 multiplied by the acceleration due to gravity (9.80 m/s²), resulting in approximately (c) 13.7 m/s².
Step-by-step explanation:
The student is asking about the acceleration astronauts feel during the liftoff of a space shuttle. When astronauts experience 1.4 times the acceleration due to gravity, this is referred to as 1.4g. Since the acceleration due to gravity (g) is 9.80 m/s², to find the acceleration astronauts feel, we need to multiply this value by 1.4.
1.4g = 1.4 × 9.80 m/s² = 13.72 m/s²
Rounded to two decimal places, the acceleration is approximately 13.7 m/s², which corresponds to selection (c).