# Out of Control Elevator

Pro Problems > Physics > Motion and Forces > Linear Motion > Force## Out of Control Elevator

An elevator has a mass of 2,000 kg. An upward force of 21,000 Newtons is applied to the elevator. The elevator travels up 50 floors, and each floor is 2.5 meters tall, with a 20 centimeter gap between floors. How long does it take the elevator to arrive, and at what speed will it be traveling?

## Solution

In order to make it feasible for teachers to use these problems in their classwork, no solutions are publicly visible, so students cannot simply look up the answers. If you would like to view the solutions to these problems, you must have a Virtual Classroom subscription.## Similar Problems

### Add a Passenger

A 50 slug car can accelerate from 0 to 50 ft/s while traveling 1000 feet. The car then stops, and a passenger gets in. Now the car can accelerate from 0 to 50 ft/s while traveling 1050 feet. What is the weight of the passenger?

### Missile Launch

A 5.0 kg missle is projected from rest to a speed of 4.5 x 10^{3} m/s. How much time is required to do this by a net force of 5.3 x 10^{5} N?

### Hockey Stick and Puck

A hockey stick travels backward 11.0 cm while intercepting a 0.140 kg puck. How much force did the stick exert on the puck to bring the puck from 35.0 m/s to rest?

### M1 and M2

A mass, m_{1}, accelerates at 3 m/s^{2} when a force, F, is applied. A second mass, m_{2}, accelerates at 1.0 m/s^{2} when F is applied to it.

- Find the value of the ratio m
_{1}/m_{2}. - Find the acceleration of the combined mass ( m
_{1}+ m_{2}) under the action of the force, F.

### Fastest Ride

I would like to get from City A to City B, which are 200 miles apart, in the shortest amount of time, given the stipulation that I don't want to experience a force more than 4 times the force of gravity. What is shortest amount of time this trip can take?

### Accelerating Car

### Force on Two Objects

If a force accelerates 4.5 kg at 40 m/s^{2}, that same force would accelerate 18 kg by how much?

### Car and Motorcycle

A force is applied to a 1000 kg car, and causes the car to accelerate from 0 m/s to 25 m/s while traveling 200 m. The same force is applied to a 600kg motorcycle. How far will the motorcycle travel while accelerating from 10 m/s to 40 m/s?

### Moving a Box

Jamal is pulling a 4,900 N box with a force of 500 N. Jakob is pulling in the opposite direction with a force of 350 N. How fast will the box be moving after 5 seconds?

### Force and Friction on a Crate

If the coefficient of kinetic friction between a 35 kg crate and the floor is .30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if µ_{k} is zero?