A bird is tossing (flying to and fro) between two cars moving towards each other on a straight road. One car has a speed of $18 km / hr$ while the other has the speed of $27 km / hr$ . The bird starts moving from the first car towards the order and is moving with the speed of $36 km / hr$ and when the two cars were separated by $36 km$ . What is the total distance covered by the bird? What is the total displacement of the bird?

Important Questions on Motion in a Straight Line

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Physics - Class 11>Chapter 3 - Motion in a Straight Line>SA>Q 3.20

A man runs across the roof-top of a tall building and jumps horizontally with the hope of landing on the roof of the next building which is of a lower height than the first. If his speed is

9 m / s

, the (horizontal) distance between the two building is

10 m

and the height difference is

9 m,

will he be able to land on the next building? (take

g = 10 m / s^{2}

)

MEDIUM

11th CBSE

IMPORTANT

NCERT Exemplar Physics - Class 11>Chapter 3 - Motion in a Straight Line>SA>Q 3.21

A ball is dropped from a building of height

45 m

. Simultaneously another ball is thrown up with a speed

40 m / s

. Calculate the relative speed of the balls as a function of time.

HARD

11th CBSE

IMPORTANT

NCERT Exemplar Physics - Class 11>Chapter 3 - Motion in a Straight Line>LA>Q 3.24

A motor car moving at a speed of

72 km / h

cannot come to stop in less than

3.0 s

while for a truck this time interval is

5.0 s

. On a highway, the car is behind the truck both moving

72 km / h

. The truck gives a signal that it is going to stop at an emergency. At what distance the car should be from the truck so that it does not bump onto (collide with) the truck? Human response time is