The velocity y of a particle in a time t is given by the equation
y = 10 + 2t\(^2\)
Find the instantaneous acceleration after 5 seconds
A
60 ms-2
B
20 ms-2
C
15 ms-2
D
10 ms-2
Verified Correct Answer: B.
Physical Principles & Numerical Solution
The velocity V = 10 + 2t\(^2\)
But acceleration, a = dv/dt
thus if V = 10 + 2t\(^2\)
dv/dt = 4t
And t = 5s then a = 4x5 = 20m/s\(^2\)
∴ a = 20m/s\(^2\)
Source: Myschool Past Questions Archive (Record #11275)