The area under a speed-time graph represents a physical quantity which has the unit of :

A. m

B. m²

C. m s^-1

D. m s^-2

A bus moving along a straight line at 20 m/s undergoes an acceleration of 4 m/s². After 2 seconds, its speed wil be :

A. 8 m/s B. 12 m/s

C. 16 m/s D. 28 m/s

The slope of a speed-time graph gives :

A. distance travelled

B. velocity

C. acceleration

D. displacement

If the displacement of an object is proportional to the square of time, then the object is moving with :

A. uniform velocity

B. uniform acceleration

C. increasing acceleration

D. decreasing acceleration

Answer||B

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

A. car A is faster than car D

B. car B is the slowest

C. car D is faster than the car C

D. car C is the slowest