JEE Main 2019 — Physics solution | Fundamenthol

JEE Main2019Physics

Q.

A block of mass m is kept on a platform which starts from rest with constant acceleration g/2 upward, as shown in fig. Work done by normal reaction on block in time t is :

A
0
B
$\frac{3 m g ^{2} t ^{2}}{8}$
C
$- \frac{m g ^{2} t ^{2}}{8}$
D
$\frac{m g ^{2} t ^{2}}{8}$

Solution

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