Question

When is the object at rest?

• A. t = 5 sec
• B. t = 10 sec
• C. t = 20 sec
• D. t = 30 sec

Answer 1

The correct option is B

t = 10 sec

Around the time t = 10 sec the particle's displacement is constant i.e. 10 m.

This means the particle is +10 m displaced from the starting point and is not moving for some time interval. So for that interval the particle is at rest.