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Standard XII

Physics

Second Law of Motion

A parachutist...

Question

A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms $^{- 1}$ and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.

600 N

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1200 N

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1350 N

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1950 N

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Solution

The correct option is C
1350 N

0 $^{2}$ = 2 $^{2}$ - 2a $\frac{1}{4}$
a = 8m/s $^{2}$
a $_{T}$ = (10 + 8 = (18m/s $^{2}$
f = ma
= 75 $\times$ 18
= 1350 N

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A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms−1 and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.

The correct option is C 1350 N 02 = 22 - 2a14 a = 8m/s2 aT = (10 + 8 = (18m/s2 f = ma = 75 × 18 = 1350 N

A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms $^{- 1}$ and comes to a halt over a distance of 0.25m. The average force from the ground on her is close to.

The correct option is C
1350 N

0 $^{2}$ = 2 $^{2}$ - 2a $\frac{1}{4}$
a = 8m/s $^{2}$
a $_{T}$ = (10 + 8 = (18m/s $^{2}$
f = ma
= 75 $\times$ 18
= 1350 N