Answer 1) Acceleration = change in v/t = 100 km/h/10 s = 10 km/h.s.
Answer 2) here a = Acceleration due to gravity. = 9.8m/s^2 and t = 1 sec, u = 0
s = 4.9m
Answer 3) Air resistance is a frictional resistance. Resistance is offered by air to any object moving through the space. it is a force that acts in a direction exactly opposite to the direction of movement.
Since the two forces are acting in exactly opposite direction, their net resultant force will be equal to their difference.
hence, Net force = (Downward force causing the object to fall) - (Air resistance)
= 10 - 4 = 6 N downwards
If it finds a resistance of 10N south then resultant force will be equal to
6N - 10N = 4N Upwards.
Answer 4) m=4kg mass of ball, v=? velocity of ball, P=12kg⋅ms momentum of ball
Momentum is calculated using formula P=m.v
12=4 * v
v=12 / 4
v=3m/s
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