When the distance an object travels is directly proportional to the length of time, it is said to travel with
constant speed
constant acceleration
zero velocity
uniform velocity
If the time-displacement graph of a particle is parallel to the time-axis, the velocity of the particle is
infinity
equal to acceleration of the body
unity
zero
Which of the following physical quantity is different from others ?
speed
distance
energy
average velocity
The SI unit for the resultant velocity is
m/s
km/s
cm/s
mm/s
The distance travelled by a freely falling body is proportional to
the mass of the body
the square of the acceleration due to gravity
the square of the time of fall
the time of fall
A body covers half the distance with a speed of 20 m/s and the other half with a speed of 30 m/s. The average velocity of the body during the whole journey is
24 m/s
25 m/s
none of these
In the equation of motion, S = ut +1/2 at2 , S stands for
distance in t seconds
distance in the tth second
maximum height reached
Which of the following distance-time graph (fig.1.45) represents the acceleration motion of a body ?
A car increases its speed from 20 km/h to 50 km/h in 10 seconds. Its acceleration is
30 ms-2
2 ms-2
18 ms-2