Important Questions of Motion in Straight Line Physics | Zigya

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191.

A body is at rest at x = 0 and t = 0, it starts moving in the positive X-direction with a constant acceleration. At the same instant, another body passes through x = O moving in the positive X-direction with a constant speed. The position of the first body is given by x1 (t) after time t and that of second body by x2 (t) after the same time interval. Which of the following graphs correctly describes (x− x2) as a function of time t ?


192.

The given graph shows the variation of velocity with displacement. Which one of the graphs given below correctly represents the variation of acceleration with displacement.


193.

In figure shown below, a particle is travelling counter clockwise in circle of radius 10 m. The acceleration vector indicated at a specific time. Find the value of 'v' at this time.

   

  • 10 m/s

  • 15 m/s

  • 20 m/s

  • 7 m/s


194.

A ball which is at rest is dropped from a height h metre.  As it bounces off the floor its speed is 80% of what it was just before touching the ground. The ball will then rise to nearly a height

  • 0.94 h

  • 0.80 h

  • 0.75 h

  • 0.64 h


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195.

Two bodies of different masses are dropped from heights of 16 m and 25 m respectively. The ratio ofthe time taken by them to reach the ground is

  • 2516

  • 54

  • 45

  • 1625


196.

A man of height h walks in a straight path towards a lamp post of height H with uniform velocity u. Then the velocity of the edge of the shadow on the ground will be

  • huH - h

  • HuH + h

  • H - hHu

  • H + hHu


197.

A train of 150 m length is going towards north direction at a speed of 10 ms-1 . A parrot flies at a ,speed of 5ms-1 towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

  • 12 s

  • 8 s

  • 15 s

  • 10 s


198.

The area under acceleration-time graph gives

  • distance travelled

  • change in acceleration

  • force acting

  • change in velocity


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199.

The distance travelled by an object along a straight line in time t is given by s= 3 − 4t + 5t2, the initial velocity of the object is

  • 3 unit

  • − 3 unit 

  • 4 unit

  • − 4 unit


200.

A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of

  • 1000 ms-2

  • 100 ms-2

  • 10 ms-2

  • 1 ms-2


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