Final answer:
When an object is released from rest near the surface of a planet, it falls under the influence of gravity. The distance the object falls can be calculated using the formula d = (1/2) * g * t^2. Hence, the correct answer is option (a) 490m.
Step-by-step explanation:
When an object is released from rest near the surface of a planet, it falls under the influence of gravity. The distance the object falls can be calculated using the formula:
d = (1/2) * g * t^2
Where d is the distance, g is the acceleration due to gravity, and t is the time. In this case, the object falls for 10 seconds, so we can plug in the values and calculate:
d = (1/2) * 9.8 * (10)^2 = 490 m
Therefore, the correct answer is a. 490 m.