hello I need help solving those questions please thank you so much in advance!

0 :1 4a. When a 4.11kg mass is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.76cm. If the 4.11kg mass is removed how far will the spring stretch if a 1.33kg is hung on it instead? 8.93x10'3 m You are correct. Your receipt no. is 162-9921 W 4b. How much work must an external agent do to stretch the spring 3.92cm from its unstretched position? 5.21J Submit Answer Incorrect. Tries 5/10 Previous Tries '3 6a. A 215g block is pressed against a spring of force constant 1.26kN/m until the block compresses the spring 11.0cm. The spring rests at the bottom of a ramp inclined at 56.6 to the horizontal. Using energy considerations, determine how far up the incline the block moves before it stops if there is no friction between the block and the ramp. 3.2m Submit Answer Submission not graded. Use more significant gures. Tries 3/10 Previous Tries 3. Calculate the scalar product of the vectors in the figure below. Assume 0, = 110 , 02 = 136 , F = 33.8N and v = 17.0cm/s. 33.9N*m/s Submit Answer You have entered that answer before | Incorrect. Tries 2/10 Previous Tries 61 X