A stone with a mass of 2.40 kg is moving with velocity (5.20î – 1.80ĵ) m/s. (HINT: v2 : () What is the stone's kinetic energy (in J) at this velocity? J Find the net work (in J) on the stone if its velocity changes to (b) (8.00î + 4.00j) m/s.

A 0.42 kg particle has a speed of 5.0 m/s at point A and kinetic energy of 7.5 J at point B. (a) What is its kinetic energy at A? (b) What is its speed at point B? lea ng m/s (c) What is the total work done on the particle as it moves from A to B? Need Help? Read It ds.

A student who weighs 553 N climbs a stairway (vertical height of 4.2 m) in 20 s. (a) How much work is done? J (b) What is the power output of the student? W

an object of mass 2(Kg has a velocity of (i-5 +j2)m/s. It is acted upon by a force and its velocity to (i1+j2)m/s. How much work, in Nm, was done in this object?

A spring has a natural length of 24.0 cm. If a 27.0-N force is required to keep it stretched to a length of 34.0 cm, how much work W is required to stretch it from 24.0 cm to 29.0 cm? (Round your answer to three decimal places.) W =

You push your much-loved 3-kg physics book 1.29 m along a horizontal table top with a horizontal force of 2.72 N against a frictional force of 0.65 N. What is the total work in J done on the book? Give your answer to 2 decimal place.

Problem 65. A ball of mass 0.2 kg is thrown straight up in the air with a speed of 10 m/s. Find the speed of the ball when it returns to the level from which it was thrown if air resistance does -1J of work on the ball during its flight. Problem 66. As a person pushes a box of mass 2 kg across level ground, the speed of the block increases from 1 m/s to 5 m/s. Find the work done by the person on the box. Assume that no other forces do work on the box.

A stone with a mass of 2.20 kg is moving with velocity (5.401 – 2.40ĵ) m/s. (HINT: v² = ✓ · .v.) (a) What is the stone's kinetic energy (in J) at this velocity? J (b) Find the net work (in J) on the stone if its velocity changes to (8.00î + 4.00ĵ) m/s. J

How much work is required to throw a ball with a mass of 0.23 kg 30.0 m/s? Assume the ball starts at rest.

4G: E moodle.nct.edu.om 1 my youuuun 1. A massless rope that run over a frictionless pulley as shown in the figure. If M₁ = 4 Kg and M₂ = 9.5 Kg, M₁ M₂ Part A: Calculate the a) acceleration produced in the pulley in (m/s²) b) tension in the rope in Newton (N) :: Part B: If the masses start moving from rest after 0.8 s, calculate, c) the distance travelled by the mass M₁ in (m) d) the velocity with which the mass M₂ will move in 0.8s, (m/s): (e) The direction in which M₁ and M₂ move will be + 1:10