Hello guys please help A 150 g block is launched along a horizontal surface with

Question

Hello guys please help
A 150 g block is launched along a horizontal surface with the350 N force provided by a spring initially compressed 4.50 cm. After sliding along asmooth surface, the block enters a region with a rough surface of length d = 17:0 m and exits theregion at speed of 4.00 m/s. What is the coecient of kinetic friction of the rough surface?[Answer: 0.267]
You wish to row straight across a 63 m-wide river. You can rowat a steady 1.3 m/s relative to the water, and the river flows at 0.57 m/s. (a) In what direction should you head? (b) How long will it take you to cross the river? [Answer: (a) 26 towards upstream from the straight acrossdirection, (b) 54 sec]
A 150 g block is launched along a horizontal surface with the350 N force provided by a spring initially compressed 4.50 cm. After sliding along asmooth surface, the block enters a region with a rough surface of length d = 17:0 m and exits theregion at speed of 4.00 m/s. What is the coecient of kinetic friction of the rough surface?[Answer: 0.267]
You wish to row straight across a 63 m-wide river. You can rowat a steady 1.3 m/s relative to the water, and the river flows at 0.57 m/s. (a) In what direction should you head? (b) How long will it take you to cross the river? [Answer: (a) 26 towards upstream from the straight acrossdirection, (b) 54 sec] A 150 g block is launched along a horizontal surface with the350 N force provided by a spring initially compressed 4.50 cm. After sliding along asmooth surface, the block enters a region with a rough surface of length d = 17:0 m and exits theregion at speed of 4.00 m/s. What is the coecient of kinetic friction of the rough surface?[Answer: 0.267]
You wish to row straight across a 63 m-wide river. You can rowat a steady 1.3 m/s relative to the water, and the river flows at 0.57 m/s. (a) In what direction should you head? (b) How long will it take you to cross the river? [Answer: (a) 26 towards upstream from the straight acrossdirection, (b) 54 sec]
You wish to row straight across a 63 m-wide river. You can rowat a steady 1.3 m/s relative to the water, and the river flows at 0.57 m/s. (a) In what direction should you head? (b) How long will it take you to cross the river? [Answer: (a) 26 towards upstream from the straight acrossdirection, (b) 54 sec]

Explanation / Answer

How do I find the angle? and why
You wish to row straight across a 63 m-wide river. You can row at asteady 1.3 m/s relative to the water, and the river flows at 0.57 m/s. (a) In what direction should you head? [Answer: (a) 26 towards upstream from the straight acrossdirection]

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