A body released from height ‘h’ takes time’t’ to reach the ground. After time t/2, its height from the ground is
A) \(\cfrac{h}2\)
B) \(\cfrac{h}4\)
C) \(\cfrac{3h}4\)
D) \(\cfrac{h}3\)
1 Answers
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The length of a cuboid is 2 cm more than its height, whereas its breadth is 2 cm less than the height. Its height is equal to the side of a square hav
Correct Answer - 960 `cm^(3)`
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A body projected vertically upwards, reaches a height of 180 m. Find out `[g=10ms^(-2)]` (i) intial velocity of body (ii) time taken by body to reach
Correct Answer - (i)`60m//s` (ii) 6 sec (iii) 12 sec (iv )160 m (v)`-20m//s` (vi) 2 sec, 10 sec (vii) 6 sec
2 Answers 1 views
A particle when projected vertically upwards from the ground, takes time T to reach maximum height H. Find out (i) The height of the particle from gro
Correct Answer - (i) `3H//4,8H//9,8H//9,15H//16, 1:3,1:8,1:8,1:15` (ii) 1 : 7
2 Answers 3 views
A body is projected from ground with velocity u making an angle `theta` with horizontal. Horizontal range of body is four time to maximum height attai
Correct Answer - (i)`theta=45^(@)` (ii)`R=(u^(2))/(g),H=(u^(2))/(4g)` (iii) 1 : 1
2 Answers 1 views
20. A coconut of mass \( 2 Kg \) is falling from a coconut free of height \( 10 m \). Find the potential energy, kinetic energy and total energy at the following points. \( \left( g =10 m / s ^{2}\right) \) a) Before falling from the coconut tree. b) Just before hilting the ground. c) At a height \( 4 m \) from the ground. d) Which law is evident from this example?
(a) Given m = 2 kg h = 10 m Potential energy at before falling from the coconut tree. u = mgh u = 2 x 10 x 10 u = 200 joule Kinetic energy will...
2 Answers 1 views
If a body is projected horizontally from the top of a tower the time taken by it to reach the ground depends upon
B) height of the tower
2 Answers 1 views
The height from which a body is released is numerically equal to the velocity acquired finally. Then that height is
Correct option is B) 2g
2 Answers 2 views
a. Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
a. Male gamete (sperm) travels in the female reproductive tract after being released. The path which it takes to fertilise the female gamete (egg) is vagina uterus fallopian tube resulting in...
2 Answers 1 views
If a paper and a book are dropped from same height at a time, they will reach the ground at same time
B) if there were no air resistance
2 Answers 1 views
A projectile is thrown at angle `beta` with vertical.It reaches a maximum height `H`.The time taken to reach the hightest point of its path is
Correct Answer - B `t=sqrt((2H)/g)`
2 Answers 1 views