Please if you don't know how to do them, don't answer the questions. If you need anything, let me know. Two simple questions.

1. A block of mass m - D/10 kg, moving on a frictionless surface with a velocity of vi-2.0 m/s, collides with a block of mass M -B/10 kg at rest, as shown in the figure. After the collision, the m block recoils with a velocity of vr-0.5 m/s. M m M before D = 10 after a. Write initial momentum of the system by using symbols only? b. Write final momentum of the system by using symbols only? c. Use momentum conservation and solve for unknown v by using symbols? B= 15 d. Calculate V? e. Show whether the collision is elastic or inelastic? f. Find the impulse of one object? 2. Three-point particles of masses mi-0.5kg, m2-1.0kg and ma-0.75kg are located an equilateral triangle of edge length a=D cm. Where is the center of mass of the system from the origin where mass my is located? m3 D- - 10 m1 m 2 a. Choose origin as the position of m2 and write x,y coordinates for three masses? b. Find X and Y coordinates of center of mass c. Calculate the resultant center of mass