# Kinematics (NEET Physics): Questions 121 - 125 of 229

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## Question number: 121

» Kinematics » Uniformly Accelerated Motion

### Question

The angular velocity of a particle is given by co = 5t - 3t ^{2} + 1, the time when its angular acceleration decreases to be zero will be -

### Choices

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

a. | 0.25 sec | |

b. | 1.2 sec | |

c. | 0.83 sec | |

d. | 25 sec |

## Question number: 122

» Kinematics » Uniform Circular Motion

### Question

A particle revolving in a circular path completes first one third of circumference in 2 sec, while next one third in 1 sec. The average angular velocity of particle will be - (in Rad/sec)

### Choices

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

a. | π/3 | |

b. | 2π/3 | |

c. | 4π/3 | |

d. | 5π/3 |

## Question number: 123

» Kinematics » Motion in a Plane

### Question

A projectile is thrown at an angle 0 and (90° - 0) from the same point with same velocity 98 m/s. The heights attained by them, if the difference of heights is 50 m will be (in m)

### Choices

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

a. | 270, 220 | |

b. | 200, 150 | |

c. | 250, 200 | |

d. | 300, 250 |

## Question number: 124

» Kinematics » Average Speed and Instantaneous Velocity

### Question

Savita throws a ball horizontally with a velocity of 8 m/s from the top of her building. The ball strikes to her brother Sudhir playing at 12 m away from the building. What is the height of the building?

### Choices

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

a. | 7m | |

b. | 8m | |

c. | 10m | |

d. | 11m |

## Question number: 125

» Kinematics » Average Speed and Instantaneous Velocity

### Question

Choose the correct options

(1) A ball is dropped from the window of a moving train on horizontal rails, the path followed by the ball as observed by the observer on the ground is parabolic path.

(2) If T be the total time of flight of a current of water and H be the maximum height attained by it from the point of projection, then H/T will be (1/4) u sin 0

(u = projection velocity and 0 = projection angle)

(3) A hunter aims his gun and fires a bullet directly at a monkey on a tree. At the instant bullet leaves the gun, monkey drops, the bullet misses to hit the monkey.

(4) If a baseball player can throw a ball at maximum distance = d over a ground, the maximum vertical height to which he can throw it, will be d

(Ball have same initial speed in each case)

### Choices

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

a. | 2 and 4 | |

b. | 1 and 2 | |

c. | 1 and 3 | |

d. | 1, 2 and 3 |