CBSE - Motion

1 Motion What is the position of the body in the time interval 60-70 seconds?

(1) 15 m
(2) 5 m
(3) 10 m
(4) 20 m

2 Motion A body is dropped from certain height from a uniformly ascending balloon. The correct graph showing variation of velocity with time for body is :

3 Motion 

The relation among v, w  and r is -
(1) w = v / r
(2) v = w  / r
(3) w  = r / v
(4) None of these

4 Motion Which sentence best describes the athlete whose distance-time graph is shown below?

(1) The athlete ran forward for 3 seconds, and then he ran backward for 3 more seconds.
(2) The athlete ran forward for 3 seconds, and then he stood still for 3 more seconds.
(3) The athlete ran forward for 3 seconds, and then he ran forward for 3 more seconds but with a lower speed.
(4) The athlete ran forward for 3 seconds, and then he moved forward for 3 more seconds with a greater speed.

5 Motion This is a velocity-time graph when the body is under:

(1) Non-uniform retardation.
(2) Uniform acceleration.
(3) Uniform retardation.
(4) Non-uniform acceleration.

6 Motion Area between speed-time graph and time axis gives-

(1)  Distance
(2)  Velocity
(3)  Speed
(4)  None of these

7 Motion The velocity of a bullet is reduced from 200 m/s to 100 m/s while travelling through a wooden block of thickness 10 cm. The retardation, assuming it to be uniform, will be

(1)  10 × 10⁴ m/s²
(2)  1.2 x 10⁴ m/s²
(3)  13.5 × 10⁴ m/s²
(4)  15 x 10⁴ m/s²