### Class XI

A man of mass 70 kg stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 m s−2s−2 what would be the reading on the scale?
1. 150 kg
2. 105 kg
3. 130 kg
4. 120 kg
A car accelerates at 1.5 m/s 2 in a straight road. How much is the increase in velocity in 4s ?
1. 6 m/s
2. 4 m/s
3. 3 m/s
4. 2.66
A man of mass 70 kg stands on a weighing scale in a lift which is moving downwards with a uniform acceleration of 5 m s−2s−2 what would be the reading on the scale?
1. 45 Kg
2. 35 kg
3. 53 kg
4. 35 kg
A man of mass 70 kg stands on a weighing scale in a lift which is moving upwards with a uniform speed of 10 m s−1s−1, what would be the reading on the scale?
1. 75 kg
2. 35 kg
3. 70 kg
4. 105 kg
A stone of mass 0.25 kg tied to the end of a string is whirled round in a circle of radius 1.5 m with a speed of 40 rev./min in a horizontal plane. What is the maximum speed with which the stone can be whirled around if the string can withstand a maximum tension of 200 N?
1. 35 m s−1
2. 37 m s−1s−1 H
3. 33 m s−1
4. 33 m s
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