Start Free Mock LoginAlready registered? Login here

Physics - Kinematics Question with Solution | TestHub

PhysicsKinematics1-DMedium2 minQB

PhysicsMediummultiple choice

A particle starts moving rectilinearly at time $t = 0$ such that its velocity ' v ' changes with time ' t ' according to the equation $v = t^{2} - t$ where t is in seconds and v is in $m / s$ .

Options:(select one or more)

Answer:

B, D

Solution:

$v = t (t - 1)$ : v < 0 for $0 < t < 1$ , v > 0 for $t > 1$ ; $a = 2 t - 1$ : a < 0 for $t < 1/2$ .

Retardation (v, a opposite signs): $1/2 < t < 1$ (v < 0, a > 0) - (B) correct, (A) incorrect.

Speeding up (same signs): $t > 1$ (v > 0, a > 0) - (D) correct; (C) incorrect.

Correct options: B, D

Subject:PhysicsTopic:KinematicsSubtopic:1-D

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...