Manipal Entrance Test 2013 Physics Paper

Net acceleration on the elevator car is more than acceleration due to gravity
Since elevator car is ascending upwards, from Newton’s second law, the net force is acting upwards hence resultant acceleration is
ar=(g+a)
=(9.8+1.2)=11m∕s2
Relative velocity of observer to elevator is
ur=0
from the equation
s=urt+

1

2

a,t2
2.7=0+

1

2

×11×t2
t2=

5.4

11

t=√

5.4

11

s