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```
1. The position of a 2.75⋅105 N training helicopter under test is given by r = (0.020 m/s3 )t3 I + (2.2m/s)t j - (0.060m/s2 )t2 k. Find the net force on the helicopter at t = 5.0 s. 2. A stockroom worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 3.50 m/s. The coefficient of kinetic friction between the box and the surface is 0.20. (a) What horizontal force must the worker apply to maintain the motion? (b) If the force calculated in part (a) is removed, how far does the box slide before coming to rest?

```
9 years ago

SAGAR SINGH - IIT DELHI
879 Points
```							Dear student,
Word done is given by W=f.d

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```
9 years ago
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### Course Features

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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions