Q6 of 23 Page 117

What is the speed of an apple dropped from a tree after 1.5 seconds? What distance will it cover during this time? Take g = 10m/s2

Since Apple dropped from a tree.

∴ Initial speed (u) = 0 m/s


Given in question;


Time (t) = 1.5 s


Acceleration due to gravity (g) = 10 m/s2


Now;


By Newton’s equation of motion


V = u + at.


Here a = g = 10 m/s2.


T = 1.5 s;


U = 0 m/s


⇒ Final speed (v) = u + gt.


⇒ v = 0 + 10 x 1.5.


⇒ v = 15 m/s


Hence the speed of an apple dropped from a tree after 1.5 second is 15 m/s


By Newton’s equation of motion


S = ut +


Here a = g = 10 m/s2.


T = 1.5 s;


U = 0 m/s


Distance (S) = ut +


⇒ s = 0 x 1.5 +


⇒ s = 0 +


⇒ s = .25 m.


Hence distance covered by an apple is 11.25 m.


More from this chapter

All 23 →
4

Explain why a long pole is more beneficial to the tight rope walker if the pole has slight bending.

 5

Why is it easier to carry the same amount of water in two buckets, one in each hand rather than in a single bucket?

 7

A body is projected with a speed of 40 m/s vertically up from the ground. What is the maximum height reached by the body? What is the entire time of motion? What is the velocity at 5 seconds after the projection? Take g = 10m/s2

 8

A boy is throwing balls into the air one by one in such a way that when the first ball is thrown reaches maximum height he starts to throw the second ball. He repeats this activity. To what height do the balls rise if he throws twice in a second?