Question

a block of mass 10 KG is released on a fixed wedge inside a cart which is moved with a constant velocity 10m/s towards right. Take initial velocity of block with respect to block is zero. then work done by normal reaction on block in two seconds in ground frame will be

Answer 1

Answer: The work done is zero.

Explanation:

Given that,

Mass m = 10 kg

Velocity v = 10 m/s

Initial velocity = 0

Time t = 2 sec

We know that,

The work done by normal reaction on block is zero because the angle is $90^{0}$ between the force and displacement.

$W= F\ dcos \theta$

Where,

$\theta = 90^{0}$

Therefore,

$W = 0$

Hence, the work done is zero.

Answer 2

"Given mass 'm' = 10Kg

Velocity 'v' = 10m/s

Initial velocity = 0

Time 't' = 2 sec

We know that the work done by normal reaction on block is zero because the angle is 90˚ between force and displacement

$W\quad =\quad Fd\cos {\theta}$

Here $\theta \quad =\quad 90 degree Celsius$

Hence, W = 0

The work done is zero.

so we do not have any work done by the external force even it experiences some reaction on the object."