The average speed is defined __. (A) Delta r/Delta t (B) Delta s/Delta t (C) S_r

Question

The average speed is defined __. (A) Delta r/Delta t (B) Delta s/Delta t (C) S_r/Delta t (D) None of the above The downward acceleration of an object in free-flight motion is __. (A) Zero (B) Increasing with time (C) 9.81 m/s^2 (D) 9.81 ft/s^2 In dynamics, the friction force acting on a moving object is always __. (A) In the direction of its motion (B) A kinetic friction (C) A static friction (D) Zero 4. A friction force always acts __ to the contact surface. (A) Normal (B) At 45-degrees (C) Parallel (D) At the angle of static friction

Explanation / Answer

1. The average speed is = total distance covered/total time taken

Option D is correct

2. C) the downward acceleration is 9.81m/s2

3. B) Kinetic friction

4. C) parallel

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