Question

3. A 0. 40 kg object is moving on a frictionless surface with a speed of 30 m/s. A force of

2. 0 N is applied continuously until the velocity of the object has been reversed. How long


was the force applied?

Answer 1

10s to reverse velocity in opposite direction

Step-by-step explanation:

Momentum = mass * velocity

The objects initial momentum therefore is 0.4*30=12Ns

Time = momentum / force

In order to stop the object's momentum, a force of 2N would thereforehave to be applied for 12/2=5s

In order to reverse the velocity of the object in the opposite direction, it would take twice this: 10s