Mary Leakey’s discovery of fossil footprints in volcanic ash at Laetoli was important because:

The upper part of a soil where active organic and mechanical decomposition of geological and organic material occurs is the:

The force of gravity between two masses separated by 1 m is FF. If the distance between the masses is halved, what is the new force? A) 2F2FB) 4F4FC) F/2F/2D) F/4F/4

A 2 kg object is acted upon by two forces: 10 N10 \, \text{N} to the right and 4 N4 \, \text{N} to the left. What is its acceleration? A) 3 m/s23 \, \text{m/s}^2B) 2 m/s22 \, \text{m/s}^2C) 4 m/s24 \, \text{m/s}^2D) 6 m/s26 \, \text{m/s}^2

An arrow is shot horizontally at 50 m/s. How far does it fall vertically after 3 seconds? (Take g=10 m/s2g = 10 \, \text{m/s}^2) A) 30 mB) 45 mC) 90 mD) 150 m

When does frictional force become independent of the surface area of contact? A) AlwaysB) Only in the case of kinetic frictionC) Only in the case of static frictionD) When the object moves at constant speed

The area under a velocity-time graph represents what quantity? A) SpeedB) DisplacementC) AccelerationD) Force

Hooke’s Law applies to: A) Perfectly elastic materialsB) Plastic deformationC) Both elastic and plastic materialsD) Only brittle materials

A car starts from rest and accelerates uniformly at 2 m/s² for 5 seconds. What is its final velocity? A) 5 m/sB) 10 m/sC) 15 m/sD) 20 m/s

A vehicle decelerates uniformly from 30 m/s to rest in 10 seconds. What is its acceleration? A) −3 m/s2-3 \, \text{m/s}^2B) 3 m/s23 \, \text{m/s}^2C) −2 m/s2-2 \, \text{m/s}^2D) 2 m/s22 \, \text{m/s}^2