Chapter 2 and 3 Quiz

Which of the following answer is equal to 86.2 cm?

• $8.62\ m$
  

• $0.862\ mm$
  

• $8.62\times10^{-4}\ km$

• $862\ dm$

The s-t graph as shown in diagram indicates an object moving against time. Which of the following statement is TRUE?

• The object is moving towards positive direction and its speed is decreasing gradually

• The object is moving towards positive direction and its speed is increasing gradually

• The object is moving towards negative direction and its speed is decreasing gradually

• The object is moving towards negative direction and its speed is increasing gradually

A man rides in a hot air balloon ascending at a speed 10 ms^-1. He releases a stone at a height 60 m. How long does it take for this stone to hit the ground?

• 2.69 s

• 3.16 s

• 3.87 s

• 4.67 s

Diagram shows a v-t graph of a car. Which of the following s-t graph represents the car's motion?

• 
• 
• 
• 

A tennis ball drops from a certain height freely. It falls to the floor and bounces back once. Taking downward displacement as positive, which of the following s-t graph best describes the motion of the ball?

• 
• 
• 
• 

Diagram shows X, Y and Z represents the location of three places. Object A moves directly from X to Z while object B moves from X to Y then to Z. If the time taken by the two objects are the same, which of the following statements is TRUE?

• They have the same average speed

• They have different average velocity

• They travel the same distance

• They have the same displacement

A ball is thrown downward from top of a building. The initial velocity is u while the final velocity is v. What is the time taken by the ball to reach the ground?

• $\frac{\left(v-u\right)}{g}$

• $\frac{\left(v-u\right)}{2g}$

• $\frac{\left(v^2-u^2\right)}{2g}$

• $\frac{\sqrt{\left(v^2-u^2\right)}}{g}$

Diagram shows a running route of a person from A to B then to C through a semi-circle of 3 m and 5 m. What is the distance travel and displacement of the person?

• $d=16\ m,\ s=16\ m$

• $d=8\ m,\ s=8\pi\ m$

• $d=8\pi\ m,\ s=16\ m$

• $d=16\ m,\ s=8\pi\ m$

Which of the following statement about motion is FALSE?

• An object with positive velocity, negative acceleration, the object is accelerating

• An object with negative velocity, negative acceleration, the object is accelerating

• An object with negative velocity, positive acceleration, the object is decelerating

• An object with positive velocity, positive acceleration, the object is accelerating.

Assuming east as positive direction while west as negative direction. A horse ran toward the west 3 km then ran towards a point which is 2 km east of the origin point. The distance travel and displacement is?

• $d=5\ km,\ s=-3\ km$

• $d=6\ km,\ s=3\ km$

• $d=8\ km,\ s=2\ km$

• $d=8\ km,\ s=-2\ km$