## A stone is thrown vertically upward with an initial velocity v0. The distance travelled in time (1.5v_0)/g is

Q. A stone is thrown vertically upward with an initial velocity v0. The distance travelled in time $\displaystyle \frac{1.5v_0}{g}$ is

(a) $\displaystyle \frac{{v_0}^2}{2 g}$

(b) $\displaystyle \frac{3{v_0}^2}{8 g}$

(c) $\displaystyle \frac{5{v_0}^2}{8 g}$

(d) None of these

Ans: (c)

## A body is projected vertically upwards with a velocity ‘u’. It crosses a point in its journey at a height ‘h’ twice, just after …..

Q. A body is projected vertically upwards with a velocity ‘u’. It crosses a point in its journey at a height ‘h’ twice, just after 1 and 7 seconds. The value of u in ms-1 is (g = 10ms-2)

(a) 50

(b) 40

(c) 30

(d) 20

Ans: (b)

## A body is projected with a velocity u. It passes through a certain point above the ground in t1 The time after which…..

Q. A body is projected with a velocity u. It passes through a certain point above the ground in t1 The time after which the body passes through the same point during the return journey

(a) $\displaystyle (\frac{u}{g}-t_1^2)$

(b) $\displaystyle 2(\frac{u}{g}-t_1)$

(c) $\displaystyle 3(\frac{u^2}{g}-t_1)$

(d) $\displaystyle 3(\frac{u^2}{g^2}-t_1)$

Ans: (b)

## A stone projected vertically up from the ground reaches a height y in its path at t1 seconds and after further t2 seconds reaches the ground…..

Q. A stone projected vertically up from the ground reaches a height y in its path at t1 seconds and after further t2 seconds reaches the ground. The height y is equal to

(a) $\displaystyle \frac{1}{2} g(t_1 + t_2)$

(b) $\displaystyle \frac{1}{2} g(t_1 + t_2)^2$

(c) $\displaystyle \frac{1}{2} g(t_1 . t_2)$

(d) $\displaystyle g(t_1 . t_2)$

Ans: (c)

## The friction of air causes a vertical retardation equal to 10% of the acceleration due to gravity. The maximum height & time …..

Q. The friction of air causes a vertical retardation equal to 10% of the acceleration due to gravity.  The maximum height and time to reach the maximum height will be decreased by

(a) 9%, 9%

(b) 11%, 11%

(c) 9%, 10%

(d) 11%, 9%

Ans: (a)