Question

NGSS Physics
7. Hans throws an apple straight up with an initial velocity of +35 m/s. Ignoring air resistance, how long will it take
the apple to reach the top of its path?
A 10 s
B. 3.5 s
C. 58
D. None of the above

Answer 1

Answer: 3.5 seconds

EXPLANATION:

Using the formula:
v = u + at
And taking the upwards direction as positive, we have the following information:

u = 35 m/s
a = -10m/s^2 (this is acceleration due to gravity)

At the top of its path, the apple will have a velocity of 0 m/s, therefore:

v = 0m/s

Once you substitute everything into the formula, you get:

0 = 35 + (-10)t

Therefore, t = 35/10 = 3.5 seconds