# Kinematics (NEET Physics): Questions 82 - 86 of 229

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## Passage

A particle moves along x-axis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s ^{2}. The initial velocity of particle (at time t = 0) is u = 0.

## Question number: 82 (2 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

The magnitude of displacement (in meters) by the particle from time t = 0 to t = t will be –

### Choices

Choice (4) | Response | |
---|---|---|

a. | - | |

b. | - + | |

c. |
| |

d. | None of the above |

## Question number: 83 (3 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

### Question

the distance travelled (in meters) by the particle from time to t = 0 to t = 1 is will be-

### Choices

Choice (4) | Response | |
---|---|---|

a. | 4/π | |

b. | 2/π | |

c. | 1/π | |

d. | None of the above |

## Question number: 84

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 10 m with a speed of 20 m/sec. The acceleration of the ball will be -

### Choices

Choice (4) | Response | |
---|---|---|

a. | 30 m/s | |

b. | 10 m/s | |

c. | 20 m/s | |

d. |
40 m/s |

## Question number: 85

» Kinematics » Average Speed and Instantaneous Velocity

### Assertion (Ꭺ)

Two projectiles are launched from the top of a cliff with same initial speed with different angles of projection. They reach the ground with the same speed

### Reason (Ꭱ)

The work done by gravity is same in both the cases.

### Choices

Choice (4) | Response | |
---|---|---|

a. | Both Ꭺ and Ꭱ are false | |

b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |

c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |

d. | Ꭺ is true but Ꭱ is false |

## Question number: 86

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A ball is projeced from O with an initial velocity 700 cm/s in a direction 37° above the horizontal. A ball B, 500 cml away from O on the line of the initial velocity of A, isl released from rest at the instant A is projected. The height! through which B falls, before it is hit by A and the directionl of the velocity A at the time of impact will respectively bel [given g = 10 m/s2, sin 37° = 0.6 and cos 37° = 8.0]

### Choices

Choice (4) | Response | |
---|---|---|

a. | 245 cm, 20° 44 | |

b. | 300 cm, 27° 43 | |

c. | 255 cm, 27° 43 | |

d. | 250 cm, 28° 42 |