KinematicsMedium

Question

A particle is moving in x - y plane at 2 m/s along x - axis. 2 seconds later, its velocity is 4 m/s in a direction making 60o with positive x - axis. its average acceleration for this period of motion is : -

Options

A.√5 m / s2, along  y - axis
B.√3 m / s2, along  y - axis
C.√5 m / s2, along at 60o with positive x - axis
D.3 m / s2, along at 60o with positive x - axis

Solution

vi = 2î
vf = 4 cos 60oî + 4sin 60oĵ
=
 = 2î+2√3ĵ
ᐃ = = 2î + 2√2ĵ - 2î = 2√3ĵ
= √3ĵ m/s2

Create a free account to view solution

View Solution Free
Topic: Kinematics·Practice all Kinematics questions

More Kinematics Questions

A stone falls freely under gravity. It covers distances h1, h2 and h3 in the first 5 seconds, the next 5 seconds and the...Two pulley arrangements of inure given are identical.The mass of the rope is highlighter. In fig (a), the mass m is lift...In 0.1 s, a particle goes from point A to point B, moving in a semicirle (see figure). The magnitude of the average velo...A bomber plane moving at a horizontal speed of 20 m/s releases a bomb at a height of 80 m above ground as shown. At the ...A particle is projected from a point (0, 1) on Y-axis (assume + Y direction vertically upwards) aiming towards a point (...