Question

14
A particle starting from the origin is
subjected to acceleration az = - 2 m/s and ay
= 2 m/s initial velocity of particle is 40 m/s
at 30° to x-axis. Find x component of velocity
at t = 4s.
26.64 m/s
22.44 m/s
28.00 m/s
46.75 m/s​

Answer 1

Answer:

Particle A,

u=10m/s

a=−4m/s

2

t=2

s=ut−

2

1

at

2

=10×2−

2

1

×(4)(2)

2

=20−8

=12m

Particle B,

u=20m/s

a=−2m/s

2

t=2s

s=ut−

2

1

at

2

=20×2−

2

1

×2×2

2

=40−4

=36m

S

B

−S

A

=(36−12)m

=24m