Ch 2: Kinematics In One Dimension

Distance travelled by the body in 5 minutes if it travels with a speed of 20 ms^-1.

• 6 m

• 600 m

• 6 km

• 45 km

Scalars are the one which has __________

• Magnitude only

• direction only

• Magnitude and direction

A car moving on a straight line path covers a distance of 2 km due east in 100 s, the speed & velocity of the car is

• 20 ms^-1 and 20 ms^-1

• 20 ms^-1 and 40 ms^-1

• 20 ms^-1 and 20 ms^-1 due south

• 20 ms^-1 and 20 ms^-1 due east

The unit of linear acceleration is

• 
  

  $kg-m$
  

• $\frac{m}{s}$

• $\frac{m}{s^{2\ }}$

• $\frac{rad}{s^{2\ }}$

The speed of the car is 72 kmph. What is the speed in m/s?

• 16 ms^-1

• 18 ms^-1

• 100 ms^-1

• 20 ms^-1

The speedometer on your car measures

• average speed.
• average velocity
• instantaneous speed.
• instantaneous velocity.

Which of the following is a vector quantity?

• 5 m/s

• 5m/s, east

• 5s

• none of these

Which statement describes a vector?

• It has magnitude but no direction

• It has both direction and magnitude

• It has direction but no magnitude

• It has constant magnitude but no direction

A projectile is launched at an angle of  $25\degree$ above horizontal. Ignoring air resistance, what are the projectiles horizontal and vertical accelerations when it reaches its maximum height?

• Both horizontal and vertical accelerations are zero

• The horizontal acceleration is zero and the vertical acceleration is  $9.8\frac{\text{m}}{\text{s}^2}$ .

• The horizontal acceleration is  $9.8\frac{\text{m}}{s^2}$   and the vertical acceleration is zero

• Both the horizontal and vertical acceleration are  $9.8\frac{\text{m}}{\text{s}^2}$  

As the projectile reaches its maximum height, what happened to its final velocity?

• constant

• zero

• 9.8 m/s

• -9.8 m/s