Motion in st. line and plane

If the displacement of a body is proportional to square of time then:

• The body moves with uniform velocity.

• The body moves with uniform acceleration.

• The body moves with increasing acceleration.

• The body moves with decreasing acceleration.

The displacement-time (s-t) graph of a body is shown in the figure. The accelerated path of the Body is ___________

• AB only

• CD only

• DE only.

• AB and DE both

The velocity-time graph of two bodies A and B are shown in : figure , The ratio of their acceleration is:

• 1 : √3

• 1 : 3

• √3 : 1

• √3 : √2

A ball is released from the top of a tower of eight h metres. It takes T seconds to reach the ground. What s the position of the ball in T / 3 seconds ?

a >

• h / 9 m from the ground

• 7h / 9 m from the ground.

• 8h / 9 m from the ground

• 17h / 18 m from the ground

The velocity-time graph of a body is shown in figure, the acceleration for points AB , BC and CD are:

• 2 m/s² , 1 m/s² , 2 m/s²

• 1 m/s² , 2 m/s² , 3m/s²

• 2 m/s² , 0 m/s² ,3 m/s²

• 0.5 m/s² , infinity m/s² ,0.33 m/s²

A train takes 1 hour to go from one station to another , it travels at a speed of 20 km/hr for half an hour and 30 km/hr for another half an hour. The average speed of the train is:

• 25 km /hr

• 24 km/hr

• 28 km/hr

• 23 km/hr

A particle moves along X-axis in such a way that X-coordinate varies with time according to expression x= 2-5t+6t²meters, The initial velocity of the particle is:

• -5 m/s

• 6m/s

• -3 m/s

• 2 m/s

The acceleration of a particle starting from rest varies with time according to the relation a=bt+c , Then the velocity of the particle after time t must be:

• 2bt²+ct

• 1/2 bt²+ct

• bt²+ct

• 1/2(bt²+ct)

Tags

NGSS.HS-PS2-1

A police car running with a speed of 120 km/hr chases a truck running ahead with a speed of 110 km/hr , the relative speed of car with truck is:

.

• 115 km/hr

• 10 km/hr

• 330 km/hr

• 120/110 km/hr

The velocity-time graph of a body is shown in figure , for the interval AD and DC the ratio of distance covered is:

• 3 : 1

• 1 : 3

• √3 : 1

• √3 : 2