Question

Question 1 A 275 g textbook slides up a 27.8 incline that is 4.50 m long. Using conservation of energy and assuming the incline is frictionless, what minimum initial speed is needed to accomplish this? 8.83 m/s 4.54 m/s 6.41 m/s 9.39 m/'s Question 2 A710g box is pressed against a spring on a frictionless surface. The spring is compressed 4.99 cm and the box slides away at a speed of 3.65 m/s. What is the spring constant for the spring? 0.380 N/m 1.90x10 N/m 3.80X10 N/m 51.9 N/m Question 3 You are lawn bowling and bowia 340 g ball with a speed of 6,65 m/s. Unfortunately, your ball hits a large rock, resulting in a perfectly elastic collision. If the final velocity of the rock after the collision is 269 m/s, what must the mass of the rock be? 0.0872 kg 0.340 kg 1.34 kg 00803 kg

Answer 1

ar 4.5m e 27.81 Reference level Sino- n 4. 5m >> ha 4.500 x Sin (27.8") = 2.0980 from conservation of energy 1 / 2 mv² = mgh varagh - 2x 9.8os2 x 2.0987 = 6.41 m/s Sooms foon 2 comervation of energy 1 KX ² = 1 mv2 >> K= mc2 2) K = 0.71 kg ( 34 semaine ? K = 3.6x 103 N/m VOLD Vi s® II velocity of ock after collision V2 = zmi vor + m2-M1 Voz mm2 mat m2 -> 2.69m/s = 2x 3409 x 6.65m is 340g fm2 = 340g +m2 = 1681 g M22 2034 Kg