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Laws of Motion · Question 18

JEE Main 2025 (Online) 8th April Evening ShiftMCQEasy📈 Topic in 16% papers+4−1
1

A body of mass 2 kg moving with velocity of vin = 3 i + 4 j m s-1 enters into a constant force field of 6 N directed along positive z-axis. If the body remains in the field for a period of 53 seconds, then velocity of the body when it emerges from the force field is:

  1. 3 i + 4 j + 5 k
  2. 4 i + 3 j + 5 k
  3. 3 i + 4 j - 5 k
  4. 3 i + 4 j + 5 k

Answer

(4) 3 i + 4 j + 5 k

Solution

Acceleration: a = Fm = 6 k2 = 3 k m s-2

The force has no x- or y-component, so vx = 3 and vy = 4 stay unchanged.

vz = 0 + a t = 3 53 = 5 m s-1

v = 3 i + 4 j + 5 k m s-1

Answer: (4)

JEE Main 2025 (Online) 8th April Evening Shift

Keep practising — Laws of Motion

2

A cubic block of mass m is sliding down on an inclined plane at 60 with an acceleration of g2, the value of coefficient of kinetic friction is

  1. 32
  2. 23
  3. 1 - 32
  4. 3 - 1
JEE Main 2025 (Online) 7th April Morning Shift
3

An object with mass 500 g moves along x-axis with speed v = 4 x m/s. The force acting on the object is :

  1. 8 N
  2. 4 N
  3. 5 N
  4. 6 N
JEE Main 2025 (Online) 7th April Evening Shift
4

A body of mass m is suspended by two strings making angles 1 and 2 with the horizontal ceiling with tensions T1 and T2 simultaneously. T1 and T2 are related by T1 = 3T2, the angles 1 and 2 are

  1. 1 = 30 , 2 = 60 with T2 = 3mg4
  2. 1 = 45 , 2 = 45 with T2 = 3mg4
  3. 1 = 30 , 2 = 60 with T2 = 4mg5
  4. 1 = 60 , 2 = 30 with T2 = mg2
JEE Main 2025 (Online) 4th April Morning Shift
5

[figure] A body of mass 1 kg is suspended with the help of two strings making angles as shown in figure. Magnitudes of tensions T1 and T2, respectively, are (in N) : (Take acceleration due to gravity 10 m/s2)

  1. 5 3, 5
  2. 5 3, 5 3
  3. 5, 5
  4. 5, 5 3
JEE Main 2025 (Online) 2nd April Evening Shift
6

A balloon and its content having mass M is moving up with an acceleration ‘a’. The mass that must be released from the content so that the balloon starts moving up with an acceleration ‘3a’ will be (Take ‘g’ as acceleration due to gravity)

  1. 3Ma2a + g
  2. 2Ma3a + g
  3. 3Ma2a - g
  4. 2Ma3a - g
JEE Main 2025 (Online) 28th January Evening Shift

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