The displacement of a body at any time t...

The displacement of a body at any time t after starting is given by `s=15t-0.4t^2`. Find the time when the velocity of the body will be `7ms^-1`.

20 s

15 s

10 s

5 s

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

DAILY PRACTICE PROBLEM
RESONANCE ENGLISH|Exercise DPP No.4|9 Videos
DAILY PRACTICE PROBLEM
RESONANCE ENGLISH|Exercise DPP No.5|20 Videos
DAILY PRACTICE PROBLEM
RESONANCE ENGLISH|Exercise DPP No.2|10 Videos
CURRENT ELECTRICITY
RESONANCE ENGLISH|Exercise High Level Problems (HIP)|19 Videos
ELECTRO MAGNETIC WAVES
RESONANCE ENGLISH|Exercise Exercise 3|27 Videos

Similar Questions

Explore conceptually related problems

The displace ment of a body at any time t after starting is given by s=10t-(1)/(2)(0.2)t^2 . The velocity of the body is zero after:

The displacement of a body executing SHM is given by x=A sin (2pi t+pi//3) . The first time from t=0 when the velocity is maximum is

The displacement of a body is given by s=(1)/(2)g t^(2) where g is acceleration due to gravity. The velocity of the body at any time t is

The displacement x of a particle moving along x-axis at time t is given by x^2 =2t^2 + 6t . The velocity at any time t is

At t=0 , a body starts from origin with some initial velocity. The displacement x(m) of the body varies with time t(s) as x=-(2//3)t^2+16t+2 . Find the initial velocity of the body and also find how long does the body take to come to rest? What is the acceleration of the body when it comes to rest?

The position of a body moving along x-axis at time t is given by x= (t^(2)-4t+6)m . The velocity of the body at time t = 3s is

For a particle moving in a straight line, the displacement of the particle at time t is given by S=t^(3)-6t^(2) +3t+7 What is the velocity of the particle when its acceleration is zero?

The coordinates of a body moving in a plane at any instant of time t are x=alphat^(2) and y=betat^(2) . The velocity of the body is

A body is released to fall under the influence of gravity and its equation of motion is given by s(t)=(9t^(2)+4)sec . Find the ratio of the instantaneous velocities of the body at the fifth second to that at the seventh second after release.

RESONANCE ENGLISH-DAILY PRACTICE PROBLEM-DPP No.3

The displacement of a body at any time t after starting is given by s=...
Text Solution
|
For the previous question, the acceleration of the particle at any tim...
Text Solution
|
The unit vector along vec(A)= 2 hat i + 3 hat j is :
Text Solution
|
The area of region betweeen y - sin x and x-axis in the interval [0,(...
Text Solution
|
If vec(A) and vec(B) are two non-zero vectors such that |vec(A)+vec(B)...
Text Solution
|
A particle is moving with speed 6m//s along the direction of vec(A)=2h...
Text Solution
|
The velocity of a car moving on a straight road increases linearly acc...
Text Solution
|
A ball is thrown vertically up with a certain velocity. It attains a h...
Text Solution
|
A person starts from origin and for his linear motion velocity is give...
Text Solution
|
If y = sin x l n(3x) then (dy)/(dx) will be :
Text Solution
|
int(pi//6)^(pi//3) sin(3x)dx=
Text Solution
|
A point source of light is placed in front of a plane mirror.
Text Solution
|
The radius of curvature of a plane mirror of focal length 40 cm is :
Text Solution
|
Two plane mirrors are inclined at 70^@. A ray incident on one mirror a...
Text Solution
|
Which of the sets given below any represent the magnitudes of three ve...
Text Solution
|
A body covered a distance of L m along a curved path of a quarter circ...
Text Solution
|
The displacement of a body is given by r=sqrt(a^(2)-t^(2))+t cost^(2) ...
Text Solution
|
How many capital letters of English alphabet show lateral inversion in...
Text Solution
|
A point object infront of a plane mirror has velocity -2 hat i+ 3 hat ...
Text Solution
|
Find a unit vector in the direction from point P(1,-1,2) to point Q(-1...
Text Solution
|