What amount of work should be performed to make a moving body with a mass of 6 kg if increase its velocity from υ1 = 3 m/s to υ2 = 7 m/s. A)60J. B) 80J. C) 100 J. D) 120 J.

A 4 kg rocket has a has 60 J of kinetic energy. What is the kinetic energy of the rocket if its mass increases to 12 kg and travels at the same speed?a) 20J.  b) 60J.  c) 180J. d) 540J

A small spaceship whose mass is 2200 kg (including an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 12 kW laser beam, what speed will the ship attain in 6.0 days because of the momentum carried away by the beam? Number i Units

3. As a 2.0-kg object moves from 21+ 5j ]m to ( 6i – 21 )m, 21+ 5j ]m to 6i – 2j m, the constant resultant force acting on it 3. As a 2.0-kg object moves from is equal to 4i - 3j ]N. If the speed of the object at the initial position is 4.0 m/s, what is its kinetic energy at its final position? se

A 1500kg sport car is moving westbound at 20m/s on a level road when it collided with a 4000kg truck driving east on the same road at 15m/s. The two vehicles remain locked together after the collision.b) what is the total kinetic energy of the two vehicles just after collision

3. Which of the following statements correctly describes the relationship between an objects kinetic energy and its speed? a. E k is directly proportional to the speed of the object b. E k is directly proportional to the speed squared of the object c. E k is inversely proportional to the speed of the object d. E k is inversely proportional to the speed squared of the object e. none of the above describe the relationship

5. After: 30⁰ Before: 2 1 2 V' m₁ = 2 kg m₂ = 3kg h = 50 cm Mass 1 is released from rest from height hand slides down a frictionless 30° slope then collides with mass 2. The two masses then stick together and move as a unit on the horizontal ground. a. What is the speed of mass 1 at the bottom of the slope just before it hits mass 2? b. Mass 2 is initially at rest at the bottom of the slope. Mass 1 now collides with mass 2. Find the speed of the combined masses after the collision. c. How much energy was lost in this collision?

There are 2 cars. Assuming the first car has a mass of 1000 Kg, which has greater kinetic energy? a. The first car traveling at 30 m/s b. a second car of half the mass traveling at 60 m/s. c. both have the same kinetic energy d. need more information

A 65 kg person rides a 20 kg bicycle at a speed of 11 m/s. The cyclist runs into a parked car and comes to a fast stop. The bike collapses 0.95 m during the crash.  a) Determine the kinetic energy of the cyclist/bike before the crash.  b) Find the average force exerted on the cyclist/bike by the parked car.

1. If the kinetic energy of a particle is tripled, by what factor has its speed increased? The speed is Multiplied by a factor= B) If the speed of a particle is decreased by a factor of three, by what factor does its kinetic energy change? the kinetic energy is multiplied by a factor=