A bullet is shot vertically downwards with an | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The bullet is moving downwards. Let the downward direction be negative. The initial velocity is $u = -100\,m/s$.The acceleration due to gravity is

Vedclass · Accepted Answer

Vedclass · Answer

(A) The bullet is moving downwards. Let the downward direction be negative. The initial velocity is $u = -100\,m/s$.The acceleration due to gravity is $g = 10\,m/s^2$ downwards,so $a = -10\,m/s^2$.The velocity at any time $t$ (for $0 \le t \le 10\,s$) is given by $v = u + at = -100 - 10t$.At $t = 0\,s$,$v = -100\,m/s$.At $t = 10\,s$,$v = -100 - 10(10) = -200\,m/s$.After $t = 10\,s$,the bullet hits the ground and comes to rest,so $v = 0$ for $10\,s The graph starts at $-100\,m/s$,decreases linearly to $-200\,m/s$ at $t = 10\,s$,and then stays at $0$ from $t = 10\,s$ to $t = 20\,s$. This corresponds to the graph in option $A$.

Similar Questions

The velocity-time graphs of a car and a scooter are shown in the figure. $(i)$ The difference between the distance travelled by the car and the scooter in $15\, s$ and $(ii)$ the time at which the car will catch up with the scooter are,respectively:

The position of a particle moving along the $y-$ axis is given as $y = 3t^2 - t^3$,where $y$ is in $m$ and $t$ is in $s$. The time when the particle attains the maximum positive position will be ........ $s$.

The speed-time graph of a particle moving along a fixed direction is shown in the figure. Obtain the distance traversed by the particle in $m$ between $t=2\;s$ to $6\;s$.

The position $(x)$ of a particle moving along the $x$-axis varies with time $(t)$ as shown in the figure. The average acceleration of the particle in the time interval $t=0$ to $t=8 \, s$ is ........... $m/s^2$.

The position $x$ of a particle varies with time $t$ as $x = ct^2 + b$,where $c$ and $b$ are positive constants. Which of the following graphs is correct?

Vedclass Test Series

Exam Paper Generator

Online Exam Module