MENU

A body of mass 2 kg travels according to the law x(t)=pt+qt²+rt³

A Body Of Mass 2 Kg Travels According To The Physics Question

A body of mass 2 kg travels according to the law x(t)=pt+qt²+rt³,where p=3 m/s,q=4 m/s² and r=5 m/s³.The force acting on the body at t=2 s is

Options

(a) 136 N
(b) 134 N
(c) 158 N
(d) 68 N

Correct Answer:

136 N

Explanation:

m = 2 kg, x = pt + qt² + rt³
⇒ dx/dt = p + 2qt + 3rt²
d²x/dt² = 2q + 6rt = acceleration(a)
At t=2s,
a = 2q +12r = 2 x 4 + 12 x 5
= 68 m/s²
F=ma = 2 x 68 = 136 N.

Related Questions:

  1. A cockroach is moving with a velocity v in anticlockwise direction on the rim
  2. On bombarding U²³⁵ by slow neutron, 200 MeV energy is released. If the power output
  3. Rate of photoelectric emission is proportional to
  4. A 1Ω resistance in series with an ammeter is balanced by 75 cm of potentiometer wire
  5. 1 Wb/m² equal to

Topics: Laws of Motion (103)
Subject: Physics (2479)

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*