A pendulum bobof masss 50 g is suspended from the ceiling of an elevator. Find the tension in the string if the elevator a. goes up with acceleration `1.2 m/s^2`, b. goes up with deceleration `1.2 m/s^2`, c. goes up with uniform velocity, d. goes down with acceleration `1.2 m/s^2` e. goes down with deceleration `1.2 m/s^2` and f. goes downwith uniform velocity.

Explanation

From the fre body diagram `R+ 0.5+2-W=0`
` rarr R= W-0.5 xx2`
`=0.5xx10-0.5xx2`
` =0.5(10-2)==4N`

So, the force exerted by the block A on the block B is 4 N.