An object falls freely from rest near the surface of the Earth. What is the speed of the object when it has fallen 4.9 meters from its rest position?

a) 4.9m/s

b) 96 m/s

c) 9.8 m/s

d) 24m/s

I know that it is letter "c" but I don't know why.

What kinds of difficulties do you foresee when scientists and non scientists try to communicate?

Which of the following lists of elements includes only metalloids? Kr, Si, Ca B, Ge, Sb Ge, H, Rn As, Cl, Na

A 94-ft3/s water jet is moving in the positive x-direction at 18 ft/s. The stream hits a stationary splitter, such that half of the flow is diverted upward at 45° and the other half is directed downward, and both streams have a final average speed

An athlete in the early weeks of an aerobic training program develops a decreased hemoglobin concentration but does not report disproportionate fatigue. Which of the following statements is true of the athlete's decreased hemoglobin levels? a.

Is the term used to describe an object with enough orbital energy to escape earth completely?

Convert 4,200 decigrams to grams

A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 30.00. Part of the beam is transmitted and part is reflected. Determine the angle between the reflected and transmitted rays

A 29 foot ladder leans against a building so that the angle between the ground and the ladder is 75 ∘. How high does the ladder reach up the side of the building? Round to 2 decimal places.

What is a difference between an isotope and a ion

2. An airplane travels 335 miles in 45 minutes. How fast does it travel? How fast is that in km/hr?