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A block is projected with speed 20m/s on a rough horizontal surface. The coefficient of friction between the surface varies with time as shown in figure. The speed of body at the end of 4 second will be
A block is projected with speed 20m/s on a rough horizontal surface. The coefficient of friction between the surface varies with time as shown in figure. The speed of body at the end of 4 second will be


2 years ago

Eshan
2095 Points
							Dear student,Area under the$\mu -t$curve multiplied by$mg$will give the change in momentum in that time.Hence$\Delta(mv)=m\Delta v=1.8mg$$\implies \Delta v=1.8g=18m/s$Hence final speed=$20m/s-18m/s=2m/s$

2 years ago
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### Course Features

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