Motion Grade IX

Which of the following can sometimes be ‘zero’ for a moving body?

i. Average velocity

ii. Distance travelled

iii. Average speed

iv. Displacement

• Only (i)

• (i) and (ii)

• (i) and (iv)

• Only (iv)

The speed-time graph of a car is given here. Using the data in the graph calculate the total distance covered by the car.

• 1250 m

• 875 m

• 1500 m

• 870 m

Four cars A, B, C and D are moving on a levelled, straight road. Their distance-time graphs are shown in the figure below. Which of the following is the correct statement regarding the motion of these cars?

• Car A is faster than car D

• Car B is the slowest

• Car D is faster than car C

• Car C is the slowest

A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is:

• u/g

• u^2/2g

• u^2/g

• u/2g

Which of the following figures represents uniform motion of a moving object correctly?

• (a)

• (b)

• (c)

• (d)

Which of the following is an example of non-uniform

acceleration?

• the movement of a car in a crowded road.

• The motion of a freely falling body.

• The motion of a ball rolling down an inclined

  plane.

• The motion of a bicycle going down the slope of

  a road when the rider is not pedaling and wind

  resistance is negligible.

A body thrown vertically upwards reaches a maximum

height of h. It then returns to the ground. The distance and

the displacement travelled by the body respectively

are

• h, zero

• 2h, zero

• zero, 2h

• zero, h

A body, dropped from a tower with zero velocity,

reaches the ground in 4 sec. The height of the tower

is

• 80 m

• 40 m

• 20 m

• 10 m

A stone is let to fall from a building of height 30m.

The ratio of heights fallen by it after 2s and 3s is

• 2:3

• 9:4

• 4:9

• 3:2

Morgan walks 10 miles South. Trevor walks 10 miles North in the same amount of time. They have:

• Different average speeds

• Different velocities

• Same velocity

• Same motion