Home
Class 12
PHYSICS
A block is projected with speed 20 m/s o...

A block is projected with speed 20 m/s on a rough horizontal surface. The coefficient of friction `(mu)` between the surface varies with time (t) as shown in figure. The speed of body at the end of 4 second will be `(g=10m//s^(2))`

A

2 m/s

B

5 m/s

C

7.2 m/s

D

9.5 m/s

Text Solution

Verified by Experts

Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • LAWS OF MOTION

    AAKASH INSTITUTE|Exercise Assignment (SECTION-C)|63 Videos

  • LAWS OF MOTION

    AAKASH INSTITUTE|Exercise Assignment (SECTION-D) (Assertion-Reason Type Questions)|15 Videos

  • LAWS OF MOTION

    AAKASH INSTITUTE|Exercise Assignment (SECTION-A)|65 Videos

  • KINETIC THEORY

    AAKASH INSTITUTE|Exercise EXERCISE (ASSIGNMENT) SECTION - D Assertion - Reason Type Questions|10 Videos

  • MAGNETISM AND MATTER

    AAKASH INSTITUTE|Exercise ASSIGNMENT (SECTION D)|26 Videos

Similar Questions

Explore conceptually related problems

A small body is projected with a velocity of 20.5 ms^(-1) along rough horizontal surface. The coefficient of friction (mu) between the body and surface changes with time t (in s) as the the body moves along the surface. Find the velocity at the end of 4s in m/s

block is moving on a rough surface. At time t=0, speed of the block is 20 m/s. Coefficient of friction ( mu ) between block and surface varies with time (t) as shown in figure. The magnitude of velocity of particle after t = 2 second is ( g = 10 ms^-2 )

Knowledge Check

  • A block of mass M is using on a rough horizontal surface. mu_R is the coefficient of kinetic friction between the block and the surface. What is the net force exerted by the surface on the block?

    A
    Mg
    B
    `muMg`
    C
    `Mgsqrt(1+mu_(K)^(2))`
    D
    `Mgsqrt(1-mu_(K)^(2))`

  • A body of mass 2 kg is being dragged with uniform velocity of 2 m / s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is . (4.2"joule"//cal and g=9.8 m//s^(2))

    A
    9.33 cal
    B
    10.21 cal
    C
    12.67 cal
    D
    13.34 cal

  • A block is kept on a rough horizontal surface. A variable horizontal force is acting on the block as shown in the figure. At t=0 , block is at rest. Kinectic energy of block at t=5 sec will be (g=10m//s^(2))

    A
    60 J
    B
    160 J
    C
    80 J
    D
    zero

    • Similar Questions

    Explore conceptually related problems

    A block of mass 1 kg start moving at t = 0 with speed 2 m//s on rough horizontal surface with coefficient of friction 0.2. A horizontal force F is applied in the direction of velocity which varies with time as shown in figure. Find the speed (in m/s) of particle at t = 3 s.

    A 20 kg block is originally at rest on a horizontal surface for which the coefficient of friction is 0.6 . A horizontal force F is applied such that it varies with time as shown in the figure (a) & (b). If the speed of the block after 10 s is 8v then find v . ( Take g=10m//s^(2) )

    A 20 kg block is originally at rest on a horizontal surface for which the coefficient of friction is 0.6 . A horizontal force F is applied such that it varies with time as shown in the figure (a) and (b) . If the speed of the block after 10 s is 8 v then find v . (Take g = 10 m// s^(2) )

    A wooden block of mass m resting on a rough horizontal table (coefficient of friction = mu ) is pulled by a force F as shown in figure.The acceleration of the block moving horizontally is :

    A block of mass m=5kg is resting on a rough horizontal surface for which the coefficient of friction is 0.2 . When a force F=40N is applied, the acceleration of the block will be (g=10m//s^(2)) .

    Home
    Profile