- Messages
- 152
- Reaction score
- 82
- Points
- 38
use the formula, Driving force - resistance = mass * accelerationCan someone please tell me why the answer is A:-
View attachment 22034
driving force = component of weight downwards = 2 * 9.8 * sin theta - 5 = 2 * a
theta is given by assuming that the whole figure is a right angled triangle, with theta = sin inverse (3/7)
you get a from here which is 1.7 m per sec square
u = 0
a = 1.7 m per sec square
s = 7 m
using the formula,
v square = u square + 2as
v = 4.9 m per sec.
If it helps like this post