Question

12. Position of an object moving in x - y plane in given
by r vector= (3t^2i +2tj)m. Acceleration of the particle at
t = 2 s is
(1) 14 m/s2
(2) 16 m/s2
(3) 8 m/s2
(4) 6 m/s2​

Answer 1

Answer:

ans is 6 m/s²

Explanation:

given r=3t²i+2tj

dr/dt=V=6t i +2

dv/dt=a=6m/s²

Answer 2

Answer:

4. 6m/s^2

Explanation:

• As given, r = 3t^2 + 2t
• Now, for velocity dr/dt
• So, d(3t^2 + 2t )/dt
• we,get v= 6t + 2
• Now, for a= dv/dt
• So, d(6+0)/dt^2
• Hence , a = 6m/s^2