Two objects must be in contact for them to exert a force on each other.

true
false

False

Explanation:

The given statement "Two objects must be in contact for them to exert a force on each other" is not true as there are many types of forces that doesn't require being in contact for exerting a force.

One such example is the gravitational force acting between two bodies. Gravitational force is the force of pull with which a body pulls another body without being in contact.

For two bodies of masses 'M' and 'm' separated at a distance of 'R', the gravitational force is given as:

The gravitational force acts always act between bodies that have mass. The bodies are not in contact yet experience force.

Therefore, the given statement is false.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the total distance traveled by the car is

30km + 49km = 79 km .