# Kinematics-Average Speed and Instantaneous Velocity (NEET Physics): Questions 64 - 67 of 108

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## Question number: 64

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A disc of mass 5 gm is kept horizontally in air by firing bullets of mass 10 g each at the rate of 20/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –

### Choices

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

a. | 9.28 cm/s | |

b. | 1.25 cm/s | |

c. | 1.96 cm/s | |

d. | 4.89 cm/s |

## Question number: 65

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then

Select the correct answers and mark it according to the following codes:

(1) If m < 1 he cannot cross the river

(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.

(3) If m > 1 he can reach a point on other bank

(4) He can reach the other bank at some point, whatever be the value of m.

### Choices

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

a. | 1 and 2 are correct | |

b. | 1, 2 and 3 are correct | |

c. | 2 and 4 are correct | |

d. | 1 and 3 are correct |

## Question number: 66

» Kinematics » Average Speed and Instantaneous Velocity

### Assertion (Ꭺ)

Rain is falling vertically downwards with velocity 6 km/h. A man walks with a velocity of 8 km/h. Relative velocity of rain w. r. t. the man is 10 km/h.

### Reason (Ꭱ)

Relative velocity is the ratio of two|velocities.

### Choices

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

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

b. | Both Ꭺ and Ꭱ are false | |

c. | Ꭺ is true but Ꭱ is false | |

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

## Question number: 67

» Kinematics » Average Speed and Instantaneous Velocity

### Question

A body of mass 0.05 kg falls from a height of 5 meter into a pile of sand. The body penetrates the sand a distance of 5 cm before stopping. What force has the sand exerted on the body?

### Choices

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

a. | -49 N | |

b. | - 19.6 N | |

c. | -196 N | |

d. | 0.196 N |