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crates of mass 80kg are loaded onto a heavy automobile, a vertical lift of 1.3m. To make the work easy a 2.6m long ramp is used and crates are pushedalong the ramp from the grounf onto the truck. the coefficient of friction between the crates and the ramp is 0.56. A) If a crate is let go from rest at the top of the ramp and begins to slide, how long will it take to reach the bottom of ramp. B) Justify the minimum value for the coefficient of static friction which prevents the crate from beginning to slide if it is let go at the top of the ramp.

crates of mass 80kg are loaded onto a heavy automobile, a vertical lift of 1.3m. To make the work easy a 2.6m long ramp is used and crates are pushedalong the ramp from the grounf onto the truck. the coefficient of friction between the crates and the ramp is 0.56.



A) If a crate is let go from rest at the top of the ramp and begins to slide, how long will it take to reach the bottom of ramp.



B)  Justify the minimum value for the coefficient of static friction which prevents the crate from beginning to slide if it is let go at the top of the ramp.


 

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