Based on your knowledge of the gravitational force near the surface of the earth

Question

Based on your knowledge of the gravitational force near the surface of the earth and on Newton's second law, explain the sign and magnitude of the acceleration of the coin in the last question during the three portions of its motion.

on its way up ;

at the highest point ;

on the way down ;

None of the other choices are correct for this situation.

-9.8 m/s2

9.8 m/s2

0 m/s2

on its way up ;

at the highest point ;

on the way down ;

None of the other choices are correct for this situation.

-9.8 m/s2

9.8 m/s2

0 m/s2

Explanation / Answer

1) C

2) D

3) B

on its way up: due to Newton II Law, force acting on coin in mg downward and its reaction is ma is upward direction so equating both we get

a-g =0 ===> a=g =9.8
on its way down : due to Newton II Law, force acting on coin in mg downward and its reaction is ma is downward direction so equating both we get a+ g =0 ==> a = -g = -9.8
on highest point : velocity is zero and acc = (v-u)/t so 0-0 / t = 0 { initial velocity is also 0}

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