# physics

4N force applied on a body mass 20kg then calculate work done in 3sec?

1. 👍
2. 👎
3. 👁
1. work = force * distance so how far?
assume v =0 at start

F = m a
4 = 20 a
a = (1/5) m/s^2

v = Vi + a t
v = 0 + 3 a

x = Xi + Vi t + (1/2) a t^2
x = 0 + 0 + (1/2)(9)
x = 4.5 meters

so
W = F x = 4 * 4.5
= 18 Joules

1. 👍
2. 👎

## Similar Questions

1. ### Physic (concepts-please check my thoughts)

A net torque applied to a rigid object always tends to produce? a)translational acceleration b) rotational equilibrium c) rotational acceleration d) rotational inertia e) none of these work (c) Torque produces torsion and tends to

2. ### Physics

A block of mass 5kg is lifted 2m in 3sec. Find the work done.

3. ### Physics

A massive steel cable drags a 20kg block across a horizontal, frictionless surface. A 100N force applied to the cable causes the block to reach a speed of 4.2m/s in a distance of 2.1m . What is the mass of the cable?

4. ### Physics

A trunk of mass m = 1.100 kg is pushed a distance d = 32.0 cm up an incline with an angle of inclination theta = 26.0 ° by a constant horizontal force P = 150. N. The coefficient of kinetic friction between the trunk and the

1. ### Physics

A grocery cart with a mass of 18 kg is pushed at constant speed along an aisle by a force F = 12 N. The applied force acts at a 20° angle to the horizontal. Find the work done by each of the forces on the cart if the aisle is 14

2. ### Physics

A luggage handler pulls a 20kg suitcase up a ramp inclined at 25 degrees above the horizontal by a force F of magnigutde 145N that acts parallel to the ramp. The coefficient of kinetic friction between the ramp and the incline is

3. ### science

if a body of a mass 4kg is acted upon at constant force of 12n at 2sec,calculate the kenetic energy gain by the body.

4. ### science

A body of mass 20kg moving with a velocity of 8m/s collides with a stationary body of mass 10kg and the two stick together.They then move with a common velocity V.Find the value of V.

1. ### Phyics help

I have a few physics questions: 1. How much mechanical work is done by a weightlifter holding a mass of 100 kg, 2.0m above the floor for 3.0 s? Explain ur answer. 2. Calculate the force needed to do 2.0 kJ of work to push a load

2. ### Physics

a 35n force acts on a body of mass 5kg for 2 seconds . calculate the change in momentum of the body?

3. ### Physics

A sled which has a mass of 45kg is sitting on a horizontal surface. A force of 120 N is applied to a rope attached to the front of the sled such that the angle between the front of the sled and the horizontal is 35 degrees. As a

4. ### PHYSICS

a body of mass 10kg is acted upon by a constant force of 30n,calculate the k.e gain by the body?