Question

only for physics exparts

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Answer 1

Explanation:

the answer is 58 metres

${v}^{2} - {u}^{2} \div 2a = s$

${u }^{2} \div 2a = s = 50m$

a driver takes 0.4 seconds to react

$0.4 \times 20 = 8$

hens net distance is 58 metres

hope it helps

Answer 2

Answer:

6.4m/sec.

Explanation:

u=20m/sec

a= -4ms-2

V=?

t=0.4sec.

using first equation of motion

V=u+at

V=20+(-4)*0.4

V=20-4*0.4

V=16*0.4

V=6.4m/sec