If the position of a 4.0 kg object is given as r(t) =(2.0 t +3.0)i +...

  

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If the position of a 4.0 kg object is given as r(t) =(2.0 t +3.0)i + (1.0 t 1.0 t +1.0) j, where is in meters, and t is in seconds. (a) What are the velocities at t = 0 and t = 1.0 s? (b) What are the speeds at t = 0 and t = 1.0 s? (c) What is the kinetic energy at t = 0 and t = 1.0 s? (d) What is the change in kinetic energy between t = 0 and t = 1.0 s? A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio (reduced to the lowest integers) of the brick's mass to the pebble's mass? If the position of a 4.0 kg object is given as r(t) =(2.0 t +3.0)i + (1.0 t 1.0 t +1.0) j, where is in meters, and t is in seconds. (a) What are the velocities at t = 0 and t = 1.0 s? (b) What are the speeds at t = 0 and t = 1.0 s? (c) What is the kinetic energy at t = 0 and t = 1.0 s? (d) What is the change in kinetic energy between t = 0 and t = 1.0 s? A brick is moving at a speed of 3 m/s and a pebble is moving at a speed of 5 m/s. If both objects have the same kinetic energy, what is the ratio (reduced to the lowest integers) of the brick's mass to the pebble's mass?