First slide

Release from certain height

Question

A body falls from a height of 100 m. After 2 sec, if the gravity disappears, it strikes the ground after

Easy

A

3 s
B

4 s
C

5 s
D

6 s

Solution

In 2 sec. distance travelled $= \frac{1}{2} \times 10 \times 4 = 20 m$
Velocity after 2 sec = gt = 20 m/s.
Time taken to travel remaining 80 m, $\frac{80}{20} = 4 \sec$

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