Answer
See the detailed answer below.
Work Step by Step
a) The given formula shows an initial velocity of a 100-g object of -30 m/s and a final velocity of 40 m/s.
And the peak force exerted on this object is about 1400 N.
- A baseball was moving to the left at a speed of 30 m/s when the player hit it with his bat, for an interval time of $\Delta t$, which made it change its direction and the ball moved to the right at a speed of 40 m/s just after it leaves the bat. During this process, the peak force exerted on the ball is 1400 N. Find $\Delta t$.
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b) See the pictorial representation below.
$$\Delta t=\dfrac{(0.1\times 40)+(0.1\times 30)}{\frac{1}{2}\times 1400}=\color{red}{\bf 0.01}\;\rm s$$
