# Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 100 - 103 of 108

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## Question number: 100

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A bullet of mass 0.01 kg travelling at a speed of 500 m/s strikes a block of mass 2 kg, which is suspended by a string of length 5 m. The center of gravity of the block is found to rise a vertical distance of 0.1 m. The speed of the bullet after it emerges from the block will be -

### Choices

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

a. | 14 m/s | |

b. | 1.4 m/s | |

c. | 220 m/s | |

d. | 110 m/s |

## Question number: 101

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –

### Choices

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

a. | , | |

b. | , | |

c. | , | |

d. | , |

## Question number: 102

» Kinematics » Average Speed and Instantaneous Velocity

### Question

The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 40 m/s ^{2} in the vertically upward direction (g = 10 m/s ^{2}), will be –

### Choices

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

a. | 120 kg/s | |

b. | 10 kg/s | |

c. | 60 kg/s | |

d. | 72 kg/s |

## Question number: 103

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

### Choices

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

a. | 0.6 m/s | |

b. | 0.3 m/s | |

c. | 0.5 m/s | |

d. | 1.2 m/s |