An isolated system with no net external force setting on it consists of an objec

Question

An isolated system with no net external force setting on it consists of an object of mass 4.0 moving with a speed of which collides with an object at rest of mass 3M. These objects stick together and travel with a new velocity u_ f after the collision. Find v_f. A) upsilon_ f = w b) upsilon_ f = 3pi/4 C) upsilon_ f = 4upsilon/tau D) upsilon_ f = 3upsilon_t E) upsilon_ f = 3 upsilon F) upsilon_ f = 7v An object of mass 1.250 kg at rest has an impulse of 25.00 kg m/s imparted to it. What is its speed after the impulse has acted? A) 20 m/s B) 31.25m/s C) 50m/s D) 62.5m/s A ball of mass m_1 = 4kg is at rest and a ball m_2 = 2kg with an initial speed of 10m/s collides with If the final speed of m_1 is 5m/s and the collision is elastic, what is the final speed of m_2? A) 5m/s B) 5Squareroot 2m/s C) 25 m/s D) 50m/s The average power delivered to an initially stationary object is 800W over the course of 2s and goes purely into changing the object's kinetic energy. If the object has a mass of 3.2 grams, what is the speed of the object after 2s? A) 1km/s B) 10km/s C) 10m/s D) 100m/s E) 1m/s F) 100km/s

Explanation / Answer

9) vf = m1v1+m2v2/m1+m2 = 4mv/7m = 4v/7

10) impulse = mv

v = 20 m/s

11) from conservation of momentum

m1u1+m2u2 = m1v1+m2v2

v2 = -10/6 = -3.33 m/s

12) 1/2mv^2/t = p

v = 1 km/s

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